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rm(list = ls())

library(Lahman)
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library(mosaic)
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library(data.table)
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=======
rm(list = ls())

library(Lahman)
library(mosaic)
library(tidyr)
library(tidyverse)
library(dplyr)
library(mplot)
library(ggplot2)
library(cluster)
library(factoextra)
library(corrplot)
library(data.table)
library(mod)
library(modelr)
library(leaps)
library(caret)
library(ISLR2)
library(glmnet)
>>>>>>> 0a71bd239790e75b2d56eb2aeea95cd144536745
#Load in People, Batting, and Pitching Dataframes
data("People") 
data("Batting")
data("Pitching")
#Merges player name to Batting data. 
bstats <- battingStats()
    str(bstats)
'data.frame':   108789 obs. of  29 variables:
 $ playerID: chr  "abercda01" "addybo01" "allisar01" "allisdo01" ...
 $ yearID  : int  1871 1871 1871 1871 1871 1871 1871 1871 1871 1871 ...
 $ stint   : int  1 1 1 1 1 1 1 1 1 1 ...
 $ teamID  : Factor w/ 149 levels "ALT","ANA","ARI",..: 136 111 39 142 111 56 111 24 56 24 ...
 $ lgID    : Factor w/ 7 levels "AA","AL","FL",..: 4 4 4 4 4 4 4 4 4 4 ...
 $ G       : int  1 25 29 27 25 12 1 31 1 18 ...
 $ AB      : int  4 118 137 133 120 49 4 157 5 86 ...
 $ R       : int  0 30 28 28 29 9 0 66 1 13 ...
 $ H       : int  0 32 40 44 39 11 1 63 1 13 ...
 $ X2B     : int  0 6 4 10 11 2 0 10 1 2 ...
 $ X3B     : int  0 0 5 2 3 1 0 9 0 1 ...
 $ HR      : int  0 0 0 2 0 0 0 0 0 0 ...
 $ RBI     : int  0 13 19 27 16 5 2 34 1 11 ...
 $ SB      : int  0 8 3 1 6 0 0 11 0 1 ...
 $ CS      : int  0 1 1 1 2 1 0 6 0 0 ...
 $ BB      : int  0 4 2 0 2 0 1 13 0 0 ...
 $ SO      : int  0 0 5 2 1 1 0 1 0 0 ...
 $ IBB     : int  NA NA NA NA NA NA NA NA NA NA ...
 $ HBP     : int  NA NA NA NA NA NA NA NA NA NA ...
 $ SH      : int  NA NA NA NA NA NA NA NA NA NA ...
 $ SF      : int  NA NA NA NA NA NA NA NA NA NA ...
 $ GIDP    : int  0 0 1 0 0 0 0 1 0 0 ...
 $ BA      : num  0 0.271 0.292 0.331 0.325 0.224 0.25 0.401 0.2 0.151 ...
 $ PA      : num  4 122 139 133 122 49 5 170 5 86 ...
 $ TB      : num  0 38 54 64 56 15 1 91 2 17 ...
 $ SlugPct : num  0 0.322 0.394 0.481 0.467 0.306 0.25 0.58 0.4 0.198 ...
 $ OBP     : num  0 0.295 0.302 0.331 0.336 0.224 0.4 0.447 0.2 0.151 ...
 $ OPS     : num  0 0.617 0.696 0.812 0.803 ...
 $ BABIP   : num  0 0.271 0.303 0.326 0.328 0.229 0.25 0.404 0.2 0.151 ...
    

People$name <- paste(People$nameFirst, People$nameLast, sep = " ")

batting_name <- merge(Batting,
                 People[,c("playerID", "name")],
                 by = "playerID", all.x = TRUE)

#Merges player name to Pitching data.

People$name <- paste(People$nameFirst, People$nameLast, sep = " ")

pitching_name <- merge(Pitching,
                 People[,c("playerID", "name")],
                 by = "playerID", all.x = TRUE)
#Creating additional stats for bstats
bstats[is.na(bstats)] = 0
#is.nan(bstats)

bstats <- bstats %>%
  mutate(K_Percent = SO / PA) %>%
  mutate(BB_Percent = (BB + IBB) / PA) %>%
  mutate_all(~replace(., is.nan(.), 0))
invalid factor level, NA generatedinvalid factor level, NA generated
bstats <- bstats %>%
  mutate_at(vars(K_Percent, BB_Percent), funs(round(., 3)))
`funs()` was deprecated in dplyr 0.8.0.
Please use a list of either functions or lambdas: 

  # Simple named list: 
  list(mean = mean, median = median)

  # Auto named with `tibble::lst()`: 
  tibble::lst(mean, median)

  # Using lambdas
  list(~ mean(., trim = .2), ~ median(., na.rm = TRUE))
bstats_salary <- bstats %>%
              filter(yearID >= 1985) %>%
              left_join(select(Salaries, playerID, yearID, teamID, salary), 
                         by=c("playerID", "yearID", "teamID"))

bstats_salary[is.na(bstats_salary)] = 0
str(bstats_salary)
'data.frame':   46535 obs. of  32 variables:
 $ playerID  : chr  "aasedo01" "abregjo01" "ackerji01" "adamsri02" ...
 $ yearID    : num  1985 1985 1985 1985 1985 ...
 $ stint     : num  1 1 1 1 1 1 1 1 1 1 ...
 $ teamID    : Factor w/ 149 levels "ALT","ANA","ARI",..: 5 35 134 117 33 102 94 134 134 134 ...
 $ lgID      : Factor w/ 7 levels "AA","AL","FL",..: 2 5 2 5 2 5 5 2 2 2 ...
 $ G         : num  54 6 61 54 54 91 22 12 36 14 ...
 $ AB        : num  0 9 0 121 0 165 36 20 0 34 ...
 $ R         : num  0 0 0 12 0 27 1 2 0 2 ...
 $ H         : num  0 0 0 23 0 46 10 4 0 4 ...
 $ X2B       : num  0 0 0 3 0 7 2 1 0 1 ...
 $ X3B       : num  0 0 0 1 0 3 0 0 0 0 ...
 $ HR        : num  0 0 0 2 0 6 0 1 0 0 ...
 $ RBI       : num  0 1 0 10 0 21 2 5 0 3 ...
 $ SB        : num  0 0 0 1 0 1 0 0 0 0 ...
 $ CS        : num  0 0 0 1 0 0 0 0 0 0 ...
 $ BB        : num  0 0 0 5 0 22 1 3 0 0 ...
 $ SO        : num  0 2 0 23 0 26 5 6 0 10 ...
 $ IBB       : num  0 0 0 3 0 5 0 0 0 0 ...
 $ HBP       : num  0 0 0 1 0 6 0 0 0 0 ...
 $ SH        : num  0 0 0 3 0 4 7 0 0 0 ...
 $ SF        : num  0 0 0 0 0 3 0 1 0 0 ...
 $ GIDP      : num  0 0 0 2 0 7 1 1 0 1 ...
 $ BA        : num  0 0 0 0.19 0 0.279 0.278 0.2 0 0.118 ...
 $ PA        : num  0 9 0 130 0 200 44 24 0 34 ...
 $ TB        : num  0 0 0 34 0 77 12 8 0 5 ...
 $ SlugPct   : num  0 0 0 0.281 0 0.467 0.333 0.4 0 0.147 ...
 $ OBP       : num  0 0 0 0.228 0 0.378 0.297 0.292 0 0.118 ...
 $ OPS       : num  0 0 0 0.509 0 0.845 0.63 0.692 0 0.265 ...
 $ BABIP     : num  0 0 0 0.219 0 0.294 0.323 0.214 0 0.167 ...
 $ K_Percent : num  0 0.222 0 0.177 0 0.13 0.114 0.25 0 0.294 ...
 $ BB_Percent: num  0 0 0 0.062 0 0.135 0.023 0.125 0 0 ...
 $ salary    : num  0 0 170000 0 147500 ...
bstats_sure <- bstats_salary %>%
  filter(PA > 150) %>%
  select(OPS, BABIP, K_Percent, BB_Percent, salary)

Data Preparation (Lesson 1 & 2)

#Keep players with over 150 at bats. (We can change this value if necessary).
#Creating batting average variable.

batting1 <- bstats %>%
  filter(AB >= 150)
  
bstats %>%
  filter(playerID == "bogaexa01")
<<<<<<< HEAD ======= >>>>>>> 0a71bd239790e75b2d56eb2aeea95cd144536745

Exploratory Analysis (Lesson 1 & 2)

Lessons 1 and 2 will just be parts of the overall project. Simple things like data manipulation, apply functions, boxplots, etc. This will be data preparation items and exploratory analysis.

b <- ggplot(batting1, aes(x = teamID, y = HR)) +
  geom_boxplot(col = "black", aes(fill = teamID))
b

hitters1 <- batting1 %>%
  filter(yearID < 1895) %>%
  select(SlugPct)

hitters2 <- batting1 %>%
  filter(yearID > 1894, yearID < 1921) %>%
  select(SlugPct)

hitters3 <- batting1 %>%
  filter(yearID > 1920, yearID < 1969) %>%
  select(SlugPct)

hitters4 <- batting1 %>%
  filter(yearID > 1969) %>%
  select(SlugPct)
#Organizing 4 different datasets looking at slugging percentage for the following boxplots. All of these are somewhat different eras, with the most dramatic split being from before 1920 (pre-Babe Ruth) and after 1920 (during and post-Babe Ruth)
boxplot(hitters1,
        main = "Slugging percentage from late 1871 - 1894",
        ylab = "Slugging percentage",
        col = "blue",
        horizontal = TRUE)

boxplot(hitters2, 
        main = "Slugging percentage from 1895-1920",
        ylab = "Slugging percentage",
        col = "yellow",
        horizontal = TRUE)

boxplot(hitters3, 
        main = "Slugging percentage from 1921-1968",
        ylab = "Slugging percentage",
        col = "red",
        horizontal = TRUE)

boxplot(hitters4, 
        main = "Slugging percentage from 1969 - present",
        ylab = "Slugging percentage",
        col = "red",
        horizontal = TRUE)

sapply(hitters1, mean, na.rm = T)
  SlugPct 
0.3456088 
sapply(hitters2, mean, na.rm = T)
 SlugPct 
0.348923 
sapply(hitters3, mean, na.rm = T)
  SlugPct 
0.3972127 
sapply(hitters4, mean, na.rm = T)
  SlugPct 
0.4088045 
#Notice that gigantic increase between hitters2 and hitters3
summary(hitters1)
    SlugPct      
 Min.   :0.1220  
 1st Qu.:0.2900  
 Median :0.3380  
 Mean   :0.3456  
 3rd Qu.:0.3970  
 Max.   :0.6960  
summary(hitters2)
    SlugPct      
 Min.   :0.1480  
 1st Qu.:0.3003  
 Median :0.3430  
 Mean   :0.3489  
 3rd Qu.:0.3910  
 Max.   :0.8490  
summary(hitters3)
    SlugPct      
 Min.   :0.1760  
 1st Qu.:0.3420  
 Median :0.3900  
 Mean   :0.3972  
 3rd Qu.:0.4440  
 Max.   :0.8460  
summary(hitters4)
    SlugPct      
 Min.   :0.1730  
 1st Qu.:0.3540  
 Median :0.4040  
 Mean   :0.4088  
 3rd Qu.:0.4580  
 Max.   :0.8630  
#Keep batting stats that we want for pairs.
batting_num <- bstats %>%
  filter(PA >= 150) %>%
  select("BA", 'OBP', 'SlugPct', "SO", "BB", "HR")
  
pairs(batting_num)

Career Batting Stats

careerBatting <- na.omit(bstats)
careerBatting <- careerBatting %>%
  select(playerID, BA, PA, SlugPct, OBP, SO, HR) %>%
  group_by(playerID) %>%
  summarise_all('mean')
careerBatting_num <- careerBatting %>%
  filter(PA >= 150) %>%
  select(BA, PA, SlugPct, OBP, SO, HR)

pairs(careerBatting_num)

corrmatrix <- cor(batting_num)
corrplot(corrmatrix, method = 'number') #Gives us correlation from pairs graph.

careerBatting_num1 <- careerBatting_num %>%
  filter(PA > 500)

0-dimensional Reduction (Lesson 4)

Bootstrapping

PCA (Lesson 4)

res <- batting_num %>% prcomp(scale = TRUE)
res
Standard deviations (1, .., p=6):
[1] 1.8624983 1.1955799 0.8163046 0.5272521 0.3234188 0.2296540

Rotation (n x k) = (6 x 6):
               PC1         PC2         PC3         PC4        PC5          PC6
BA      -0.3736490  0.53149382  0.20948811 -0.39409469  0.6134310  0.049063667
OBP     -0.4412694  0.38795844 -0.30295510 -0.06651166 -0.5817204  0.469217735
SlugPct -0.4816546  0.08527252  0.45916589  0.20230952 -0.3441137 -0.624948649
SO      -0.2974863 -0.61917967  0.04176753 -0.71554909 -0.1194610  0.009617743
BB      -0.4043725 -0.14520286 -0.75150469  0.19652707  0.2909420 -0.356888661
HR      -0.4262175 -0.39403532  0.29495049  0.49870136  0.2607132  0.509317820
loadings <- res$rotation
loadings
               PC1         PC2         PC3         PC4        PC5          PC6
BA      -0.3736490  0.53149382  0.20948811 -0.39409469  0.6134310  0.049063667
OBP     -0.4412694  0.38795844 -0.30295510 -0.06651166 -0.5817204  0.469217735
SlugPct -0.4816546  0.08527252  0.45916589  0.20230952 -0.3441137 -0.624948649
SO      -0.2974863 -0.61917967  0.04176753 -0.71554909 -0.1194610  0.009617743
BB      -0.4043725 -0.14520286 -0.75150469  0.19652707  0.2909420 -0.356888661
HR      -0.4262175 -0.39403532  0.29495049  0.49870136  0.2607132  0.509317820
score_mat <- res$x
score_mat
                   PC1           PC2           PC3           PC4           PC5           PC6
    [1,] -2.416723e+00  4.560698e+00  1.443027e+00 -7.333664e-01 -4.234072e-01 -1.762980e-01
    [2,]  1.219725e+00  1.849015e+00  8.201252e-01 -1.952915e-01  3.981469e-01  1.822513e-01
    [3,]  1.474218e+00  7.482123e-01  9.141729e-01  8.396478e-01 -2.439173e-01 -5.416897e-01
    [4,]  6.203888e-01  2.304795e+00  1.057469e+00 -2.640564e-01  2.662469e-01  3.072002e-02
    [5,]  2.943669e+00  3.660013e-01  5.506029e-01  4.155864e-01  5.317398e-01 -3.286813e-02
    [6,]  1.777087e+00  1.308355e+00  8.996221e-01  1.318660e-01  3.669270e-01 -1.200040e-01
    [7,]  1.638294e+00  1.365860e+00  9.687942e-01  2.460817e-01  2.518894e-01 -2.846689e-01
    [8,]  1.277859e+00  1.429171e+00  1.237701e+00  3.160011e-01  2.384888e-01 -3.187137e-01
    [9,]  2.575716e+00  7.738965e-01  5.169331e-01  3.002796e-01  5.345135e-01  1.057655e-01
   [10,]  1.406601e+00  1.626801e+00  1.019207e+00  6.878197e-02  3.105486e-01 -1.622986e-01
   [11,]  2.314598e+00  1.032260e+00  3.284764e-01  1.875309e-01  4.737664e-01  3.377658e-01
   [12,] -2.254698e+00  4.915125e+00  1.951355e+00 -1.215630e+00  1.700315e-01  1.075539e-01
   [13,]  1.714346e+00  1.191014e+00  1.054853e+00  3.211466e-01  2.940316e-01 -2.832409e-01
   [14,]  4.214521e+00 -5.515752e-01  3.050290e-01  7.087223e-01  7.976724e-01  3.980669e-02
   [15,]  2.271122e+00  1.078424e+00  5.187903e-01  1.175299e-01  5.660790e-01  2.481744e-01
   [16,]  7.655863e-01  2.041193e+00  1.014612e+00  1.844765e-02  5.616512e-02 -1.959685e-01
   [17,]  1.520407e+00  1.432379e+00  1.091449e+00  2.042299e-01  2.334932e-01 -3.524935e-01
   [18,]  1.490633e+00  1.291377e+00  6.930873e-01  3.470345e-01  6.483829e-02 -9.133176e-02
   [19,] -1.993183e-01  3.201744e+00  1.191853e+00 -5.892269e-01  4.491340e-01  4.036008e-01
   [20,]  3.770710e-01  2.434379e+00  7.232593e-01 -1.258865e-01  2.812814e-02  1.074989e-01
   [21,]  2.922852e-01  2.390471e+00  1.332478e+00 -8.020927e-02  1.240978e-01 -2.261130e-01
   [22,]  7.804409e-01  2.075181e+00  2.583384e-01 -8.693810e-02  3.394759e-03  4.109240e-01
   [23,]  1.371866e+00  9.825359e-01  9.688047e-01  7.256051e-01 -2.492550e-01 -5.812617e-01
   [24,] -2.382359e+00  4.714902e+00  1.062824e+00 -1.046896e+00 -3.540856e-02  3.003221e-01
   [25,]  1.292267e+00  2.096809e+00  6.511071e-01 -4.066068e-01  6.834969e-01  5.933871e-01
   [26,] -2.777582e+00  4.944257e+00  1.755964e+00 -1.083355e+00 -5.785753e-02  1.077638e-02
   [27,]  1.190319e+00  1.795224e+00  7.511231e-01 -9.836268e-02  3.912924e-01  6.458790e-02
   [28,]  2.138132e+00  7.503777e-01  5.815927e-01  2.363811e-01  3.601793e-01  5.370821e-02
   [29,]  2.204313e+00  9.435450e-01  5.069415e-01  1.122817e-01  4.312682e-01  1.689245e-01
   [30,]  2.534510e+00  9.701706e-01  6.262459e-01  7.652271e-02  7.558703e-01  2.656094e-01
   [31,]  1.554444e+00  1.436907e+00  1.008768e+00  9.023136e-02  5.609106e-01  1.073257e-01
   [32,]  1.819823e+00  1.362150e+00  6.227748e-01  4.177417e-02  4.474395e-01  1.647032e-01
   [33,]  3.601595e+00 -6.392722e-01  4.603145e-01  4.955963e-01  5.099287e-01 -2.749128e-01
   [34,]  2.645202e-01  2.481165e+00  9.207404e-01 -6.058332e-01  4.796779e-01  3.919094e-01
   [35,]  3.421297e+00  1.147581e-02  4.038722e-01  5.460176e-01  6.062009e-01  1.169545e-02
   [36,]  2.471482e-01  2.481274e+00  8.898948e-01 -5.414952e-01  3.639352e-01  1.736046e-01
   [37,]  2.150533e+00  1.295666e+00  5.544389e-01  1.153722e-02  6.516006e-01  3.546918e-01
   [38,]  3.006876e+00  8.594070e-03  8.192747e-01  5.894401e-01  4.886067e-01 -3.422591e-01
   [39,]  1.854183e-02  2.884613e+00  1.174663e+00 -5.676400e-01  3.734326e-01  1.501689e-01
   [40,]  1.393717e+00  1.754510e+00  7.957141e-01 -1.746703e-01  5.928169e-01  3.670016e-01
   [41,]  2.260195e+00  6.986164e-01  1.076252e+00  4.301822e-01  3.090228e-01 -5.521915e-01
   [42,]  5.987150e-02  2.642965e+00  1.483975e+00 -2.125679e-01  2.386474e-01 -2.420331e-01
   [43,]  4.316153e-01  2.249363e+00  8.628850e-01 -2.927017e-01  3.697471e-01  1.355797e-01
   [44,]  1.114305e+00  1.925993e+00  7.971480e-01 -1.876282e-01  4.587106e-01  1.283862e-01
   [45,]  1.854586e-01  2.651860e+00  1.294539e+00 -4.079149e-01  5.125728e-01  2.486702e-01
   [46,]  1.893873e-01  2.772122e+00  1.357466e+00 -4.803023e-01  5.973779e-01  3.360247e-01
   [47,]  7.292379e-01  1.737208e+00 -2.609344e-01 -9.363625e-02 -4.368283e-02  4.379741e-01
   [48,]  1.847550e+00  1.276145e+00  7.167369e-01 -2.892983e-02  5.097654e-01  1.042807e-01
   [49,]  3.626601e+00 -8.547987e-02  2.693330e-01  4.713822e-01  7.559704e-01  1.828194e-01
   [50,]  1.930785e+00  1.394545e+00  6.893944e-01 -6.183811e-02  6.532000e-01  2.401690e-01
   [51,] -6.078538e-02  3.176777e+00  1.211221e+00 -6.759564e-01  4.986540e-01  3.306064e-01
   [52,]  2.339012e+00  6.987610e-01  1.334819e-01  2.047737e-01  4.287504e-01  2.192671e-01
   [53,]  9.842678e-01  2.225258e+00  1.096110e+00 -3.051193e-01  5.516512e-01  1.454291e-01
   [54,]  1.455407e+00  1.672343e+00  9.417622e-01 -6.577560e-02  4.895289e-01 -1.238487e-03
   [55,]  4.300761e+00 -9.084043e-01  2.143078e-01  9.553783e-01  6.595707e-01 -6.440636e-02
   [56,]  4.710233e-01  1.423581e+00  1.662245e+00  4.631328e-01  2.677690e-01 -3.133157e-01
   [57,]  1.649192e+00  1.423337e+00  1.162990e+00  7.234994e-02  5.394208e-01 -1.026508e-01
   [58,]  2.768852e+00  1.478174e-01  8.899297e-01  5.451073e-01  3.915213e-01 -3.815478e-01
   [59,]  2.099573e+00  1.023482e+00  9.221362e-01  1.216150e-01  6.103257e-01  1.984430e-02
   [60,]  1.569637e+00  1.275754e+00  1.234741e+00 -7.314692e-03  4.644239e-01 -2.085609e-01
   [61,] -1.498821e-01  3.080767e+00  1.334832e+00 -5.264526e-01  3.427686e-01  4.359203e-02
   [62,]  2.568969e+00  9.856887e-01  6.948187e-01  8.865470e-02  7.938021e-01  2.354448e-01
   [63,]  1.673655e+00  9.690939e-01  8.796657e-01  1.193615e-01  4.153881e-01 -3.410592e-02
   [64,] -4.853341e-02  2.629401e+00  1.554874e+00 -1.519071e-01  2.415414e-01 -2.272155e-01
   [65,]  2.410371e+00  7.924908e-01  2.061873e-01  2.658986e-01  4.473866e-01  2.400031e-01
   [66,]  2.280413e+00  9.146890e-01  8.091815e-01  2.796219e-01  4.894963e-01 -1.584045e-01
   [67,] -2.505357e-01  3.082187e+00  1.431683e+00 -4.758327e-01  3.200074e-01  8.442382e-02
   [68,] -1.108737e+00  4.083915e+00  1.210488e+00 -1.059773e+00  4.674161e-01  5.476804e-01
   [69,]  2.146383e+00  1.108095e+00  5.400660e-01  1.272634e-01  6.767289e-01  3.062165e-01
   [70,] -3.332913e+00  5.029997e+00  1.529292e+00 -8.384134e-01 -1.736625e-01 -2.189377e-01
   [71,]  1.917417e+00  1.118149e+00  1.174363e+00  2.949981e-01  3.501859e-01 -4.599910e-01
   [72,]  2.510081e+00  4.956159e-01  4.078296e-01  5.372300e-01  4.147258e-01 -5.399929e-02
   [73,]  1.842099e+00  1.296739e+00  6.460042e-01 -8.950588e-02  5.084560e-01  2.165966e-01
   [74,]  1.946117e+00  1.088249e+00  9.342168e-01  1.443770e-01  5.197305e-01 -4.137615e-02
   [75,]  4.010638e+00 -9.043144e-01 -9.277337e-02  5.143939e-01  5.910971e-01  1.226830e-01
   [76,]  2.317837e+00  5.746190e-01  5.556606e-01  4.191115e-01  4.862667e-01  5.763530e-02
   [77,]  3.074563e-01  2.534392e+00  1.401686e+00 -3.824038e-01  4.268553e-01 -1.232876e-03
   [78,]  1.167005e+00  1.809348e+00  1.129422e+00 -4.721470e-02  4.501069e-01 -2.529551e-02
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   [80,]  2.741739e+00  5.302697e-01  3.604595e-01  2.144569e-01  5.750893e-01  2.100966e-01
   [81,]  1.971533e+00  1.017793e+00  9.299388e-01  1.804371e-01  6.125357e-01  6.301301e-02
   [82,]  2.721711e+00  2.680274e-01  2.327942e-02  2.907707e-01  3.877542e-01  2.068869e-01
   [83,]  2.135547e-01  2.706228e+00  1.040692e+00 -4.148453e-01  3.578101e-01  1.113258e-01
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   [85,]  2.360438e+00  7.127484e-01  6.694583e-01  2.299599e-01  5.813277e-01  5.283155e-02
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   [87,] -4.389638e-01  3.392092e+00  8.501625e-01 -7.063879e-01  3.920052e-01  4.741925e-01
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   [90,]  2.155863e+00  9.065004e-01  8.945369e-01  3.965488e-01  4.249762e-01 -1.818956e-01
   [91,]  1.523907e-01  2.862417e+00  1.276905e+00 -4.713282e-01  3.751188e-01  9.063007e-02
   [92,]  9.995124e-01  1.823088e+00  1.170911e+00  1.344113e-02  4.476761e-01 -1.903802e-02
   [93,]  1.110998e+00  2.110401e+00  9.938894e-01 -2.666306e-01  5.675575e-01  1.759913e-01
   [94,]  5.192421e-01  2.435532e+00  1.302713e+00 -3.091739e-01  4.550121e-01  7.071398e-02
   [95,]  7.936573e-01  2.224945e+00  1.313504e+00 -3.269706e-01  4.517846e-01 -6.770236e-02
   [96,]  8.403641e-01  2.256260e+00  1.178937e+00 -2.087666e-01  4.417500e-01 -3.706420e-02
   [97,]  1.148718e+00  1.669228e+00  2.253819e-02 -2.459589e-01  2.848365e-01  5.532400e-01
   [98,]  1.185487e+00  1.572026e+00  3.058708e-01 -8.272972e-02  2.987945e-01  1.777574e-01
   [99,]  2.380042e+00  6.606109e-01  7.417901e-01 -1.160135e-01  6.060816e-01  9.513828e-02
  [100,]  3.908648e+00 -6.824891e-01 -8.243134e-02  8.576197e-01  4.371080e-01 -5.428605e-02
  [101,]  2.174089e+00  1.264951e+00  6.906613e-01  2.511012e-02  7.083800e-01  2.293995e-01
  [102,]  1.618655e+00  1.738117e+00  8.890477e-01 -1.790972e-01  6.765123e-01  2.320327e-01
  [103,]  1.964422e+00  1.146938e+00  4.015434e-01  6.802530e-02  4.616389e-01  2.143541e-01
  [104,] -1.042642e+00  3.631385e+00  1.599374e+00 -6.467583e-01  2.788696e-01  1.557212e-01
  [105,] -3.249017e-01  2.867747e+00  1.670345e+00 -2.033250e-01  3.077568e-01 -1.065481e-01
  [106,]  1.571414e-01  2.589093e+00  1.581907e+00 -1.917588e-01  1.676164e-01 -4.610063e-01
  [107,]  3.075156e+00 -2.184416e-01  1.588215e-01  3.996932e-01  3.985028e-01  1.536229e-01
  [108,]  9.464263e-01  2.334568e+00  9.881629e-01 -4.426485e-01  6.270796e-01  3.568946e-01
  [109,] -6.112114e-01  3.051586e+00  8.299057e-01 -3.936699e-01  1.653944e-01  1.061102e-01
  [110,] -2.891211e-01  3.207652e+00  1.054573e+00 -6.829069e-01  3.826751e-01  3.203025e-01
  [111,]  1.958538e+00  1.147893e+00  4.340068e-01  1.390249e-01  5.734960e-01  2.825576e-01
  [112,]  8.340147e-02  2.055687e+00  1.394886e+00  1.639048e-01  1.670183e-01 -3.031638e-01
  [113,]  1.948431e+00  1.402737e+00  5.745996e-01 -8.495996e-02  6.732018e-01  3.401546e-01
  [114,]  1.331906e+00  1.598962e+00  1.169111e+00  7.239512e-02  4.155062e-01 -1.724547e-01
  [115,]  2.089271e+00  8.270733e-01  9.166172e-01  3.041473e-01  5.516338e-01 -6.825203e-02
  [116,]  6.652700e-01  2.346548e+00  1.092434e+00 -3.183514e-01  5.451402e-01  2.086985e-01
  [117,]  2.182842e+00  9.434587e-01  7.752312e-01  3.309184e-01  5.282321e-01 -5.022710e-02
  [118,]  5.013390e-01  2.533947e+00  1.210166e+00 -3.879506e-01  4.280099e-01  5.845775e-02
  [119,]  2.398461e+00  5.670894e-01  6.248191e-01  2.635547e-01  5.100397e-01  1.409121e-03
  [120,] -1.188190e+00  3.900769e+00  1.819585e+00 -8.126923e-01  3.070541e-01  4.488749e-02
  [121,]  2.227782e+00  1.044966e+00  9.926182e-01  1.859686e-01  5.704792e-01 -1.576408e-01
  [122,]  6.265958e-01  2.374716e+00  7.351219e-01 -2.704773e-01  3.419254e-01  2.442308e-01
  [123,] -1.527206e+00  3.792398e+00  1.498283e+00 -5.826627e-01  2.284069e-01  1.143657e-01
  [124,]  1.949358e+00  7.736311e-01  4.591902e-01  4.113739e-01  3.819606e-01  2.007939e-02
  [125,]  9.546985e-01  1.712587e+00  1.279208e+00  6.244127e-02  3.509531e-01 -2.032127e-01
  [126,]  4.175919e+00 -6.018102e-01  3.044794e-01  5.929268e-01  8.285393e-01  6.653842e-02
  [127,]  3.073146e+00  2.745347e-01  7.352831e-01  4.814719e-01  5.952238e-01 -1.992386e-01
  [128,]  1.774820e+00  1.289509e+00  6.669919e-01 -1.641910e-02  5.258865e-01  6.206168e-02
  [129,]  5.375029e-01  2.595559e+00  9.792746e-01 -4.384009e-01  5.128877e-01  2.760494e-01
  [130,]  1.598670e+00  1.663336e+00  8.385291e-01 -1.327358e-01  5.606892e-01  2.006034e-01
  [131,]  8.938875e-02  2.782653e+00  9.391116e-01 -4.292095e-01  3.250307e-01  1.562155e-01
  [132,]  4.491808e+00 -1.287511e+00  3.988355e-01  6.978455e-01  6.750664e-01 -2.784215e-01
  [133,]  3.277880e+00 -6.584339e-02  6.927470e-01  4.305486e-01  6.061131e-01 -2.223229e-01
  [134,]  1.638951e+00  1.263582e+00  1.160531e+00  2.927038e-01  3.091054e-01 -3.312571e-01
  [135,]  3.296838e+00  2.304245e-01  3.456176e-01  2.485582e-01  8.001902e-01  3.026274e-01
  [136,]  3.596579e+00 -2.680050e-01  5.883358e-01  5.459397e-01  6.462194e-01 -1.850761e-01
  [137,]  2.454556e+00  6.178760e-01  7.683971e-01  3.774372e-01  4.885282e-01 -9.600194e-02
  [138,]  3.253124e+00  2.323717e-01  4.309048e-01  3.185377e-01  7.544745e-01  1.730422e-01
  [139,]  1.970733e+00  1.018884e+00  1.053743e+00  1.557218e-01  5.270654e-01 -1.585225e-01
  [140,]  1.732010e+00  1.305955e+00  9.698273e-01  4.194498e-02  5.546218e-01  9.694220e-03
  [141,]  2.225008e+00  7.309146e-01  6.902748e-01  3.084738e-02  4.856930e-01 -3.255164e-02
  [142,]  1.097909e+00  1.474785e+00  1.536971e+00  3.588217e-01  2.872577e-01 -4.562505e-01
  [143,] -2.784413e-01  2.874435e+00  1.589095e+00 -2.842018e-01  7.354918e-02 -4.702583e-01
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  [150,]  2.674405e+00  6.525884e-01  5.475495e-01  3.712414e-02  7.278302e-01  2.354851e-01
  [151,]  3.556008e+00 -2.199490e-01  4.501220e-01  4.201832e-01  7.066383e-01 -9.600422e-03
  [152,]  7.393203e-01  2.392853e+00  1.287022e+00 -3.290517e-01  4.924273e-01  1.329802e-02
  [153,]  1.280523e+00  2.026696e+00  8.107106e-01 -2.868386e-01  6.492289e-01  3.371576e-01
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  [156,]  1.870168e+00  1.316393e+00  6.006543e-01 -4.324355e-02  5.540260e-01  2.129298e-01
  [157,]  1.371166e+00  1.486129e+00  1.384976e+00  2.654090e-01  3.073133e-01 -4.855113e-01
  [158,]  7.454876e-01  2.311675e+00  9.709886e-01 -3.586801e-01  4.676539e-01  1.803653e-01
  [159,]  3.140966e+00 -1.743634e-01  3.273602e-01  3.639460e-01  5.143199e-01 -9.705433e-02
  [160,]  2.111663e+00  1.092447e+00  5.673255e-01  4.419451e-02  5.741471e-01  1.651516e-01
  [161,]  2.319455e+00  8.086177e-01  7.777198e-01  3.865898e-01  5.497539e-01 -1.071935e-01
  [162,]  1.545696e+00  1.581049e+00  7.992864e-01 -1.243311e-01  5.378649e-01  1.187910e-01
  [163,]  3.098880e-01  2.733051e+00  1.364830e+00 -3.830859e-01  4.013289e-01 -2.839183e-02
  [164,]  1.053480e+00  2.035085e+00  1.117748e+00 -2.013981e-01  4.824652e-01 -2.245388e-02
  [165,]  3.807886e+00 -5.048465e-01  5.647328e-01  7.574360e-01  5.701567e-01 -3.459630e-01
  [166,]  2.855763e+00  5.998251e-01  4.149993e-01  3.069515e-01  6.704102e-01  1.883833e-01
 [ reached getOption("max.print") -- omitted 35229 rows ]
get_eig(res)
<<<<<<< HEAD ======= >>>>>>> 0a71bd239790e75b2d56eb2aeea95cd144536745

Screeplot

get_eig(res) %>%
  ggplot(aes(x = 1:6, y = cumulative.variance.percent)) +
  geom_line() +
  geom_point() +
  geom_hline(yintercept = 80) +
  xlab("Principal Component") +
  ylab("Proportion of Variance Explained") +
  ggtitle("Scree Plot of Principal Component for Batting Statistics")

2 Principal Components: PC1 and PC2

fviz_screeplot(res, main = "Scree Plot")

Can Identify an elbow in 3.

Biplot

res %>%
  fviz_pca_var(axes = c(1,2),
               col.var = "contrib",
               gradient.cols = c("#00AFBB", "#E7B800", "#FC4E07"),
               repel = TRUE
               )
<<<<<<< HEAD

=======

>>>>>>> 0a71bd239790e75b2d56eb2aeea95cd144536745

Cluster Analysis (Lesson 5)

#NOT COMPLETE!!!!! This was just a test, bstats is way too big.
bstats_best <- bstats %>%
  filter(PA >= 600)

eu_dist <- get_dist(careerBatting_num1, method = 'euclidean')
hc_complete <- hclust(eu_dist, method = 'complete')

plot(hc_complete)

Silhouette

res_test <- careerBatting_num1 %>% kmeans(7)
  str(res_test)
List of 9
 $ cluster     : int [1:313] 1 5 7 2 7 5 6 6 7 1 ...
 $ centers     : num [1:7, 1:6] 0.284 0.292 0.269 0.292 0.274 ...
  ..- attr(*, "dimnames")=List of 2
  .. ..$ : chr [1:7] "1" "2" "3" "4" ...
  .. ..$ : chr [1:6] "BA" "PA" "SlugPct" "OBP" ...
 $ totss       : num 651407
 $ withinss    : num [1:7] 11692 9601 15264 7699 18968 ...
 $ tot.withinss: num 108892
 $ betweenss   : num 542514
 $ size        : int [1:7] 21 37 29 27 56 91 52
 $ iter        : int 3
 $ ifault      : int 0
 - attr(*, "class")= chr "kmeans"
distance <- get_dist(careerBatting_num1, method = "euclidean")
sil <- silhouette(x = res_test$cluster, dist = distance)
summary(sil)
Silhouette of 313 units in 7 clusters from silhouette.default(x = res_test$cluster, dist = distance) :
 Cluster sizes and average silhouette widths:
       21        37        29        27        56        91        52 
0.4003255 0.3618949 0.3404187 0.4165085 0.3245905 0.4092127 0.2819611 
Individual silhouette widths:
    Min.  1st Qu.   Median     Mean  3rd Qu.     Max. 
-0.06123  0.22568  0.39691  0.36100  0.50462  0.62451 
sil %>% head()
     cluster neighbor  sil_width
[1,]       1        4 0.31068125
[2,]       5        3 0.32305899
[3,]       7        1 0.08784106
[4,]       2        7 0.12656126
[5,]       7        2 0.40706851
[6,]       5        7 0.16599027
fviz_silhouette(sil)
<<<<<<< HEAD ======= >>>>>>> 0a71bd239790e75b2d56eb2aeea95cd144536745
<<<<<<< HEAD

=======

>>>>>>> 0a71bd239790e75b2d56eb2aeea95cd144536745
fviz_nbclust(careerBatting_num1, hcut, hc_method = "complete", hc_metric = "euclidean", method = "wss")

##This is to test other values of K for the silhouette method.
res_test1 <- careerBatting_num1 %>% kmeans(10 )
  str(res_test1)
List of 9
 $ cluster     : int [1:313] 10 4 6 3 3 3 8 2 6 10 ...
 $ centers     : num [1:10, 1:6] 0.287 0.278 0.285 0.273 0.269 ...
  ..- attr(*, "dimnames")=List of 2
  .. ..$ : chr [1:10] "1" "2" "3" "4" ...
  .. ..$ : chr [1:6] "BA" "PA" "SlugPct" "OBP" ...
 $ totss       : num 651407
 $ withinss    : num [1:10] 5561 3421 7533 8158 17850 ...
 $ tot.withinss: num 82705
 $ betweenss   : num 568701
 $ size        : int [1:10] 47 26 32 35 31 29 28 40 25 20
 $ iter        : int 4
 $ ifault      : int 0
 - attr(*, "class")= chr "kmeans"
distance <- get_dist(careerBatting_num1, method="euclidean")
sil <- silhouette(x = res_test1$cluster, dist = distance)
summary(sil)
Silhouette of 313 units in 10 clusters from silhouette.default(x = res_test1$cluster, dist = distance) :
 Cluster sizes and average silhouette widths:
       47        26        32        35        31        29        28        40        25        20 
0.4123528 0.2235291 0.3095730 0.3662893 0.2348064 0.2444163 0.3084443 0.2360885 0.4169711 0.3504059 
Individual silhouette widths:
    Min.  1st Qu.   Median     Mean  3rd Qu.     Max. 
-0.07461  0.18155  0.32364  0.31245  0.44921  0.62394 
sil %>% head()
     cluster neighbor  sil_width
[1,]      10        6 0.25143884
[2,]       4        8 0.56107068
[3,]       6       10 0.21097598
[4,]       3        2 0.37769870
[5,]       3        6 0.09750601
[6,]       3        4 0.41195414
fviz_silhouette(sil)
<<<<<<< HEAD ======= >>>>>>> 0a71bd239790e75b2d56eb2aeea95cd144536745

Diana

Linear Regression (Lesson 6)

Linear Regression comparing team payroll and win rate.

teams = as.data.table(Teams)
teams = teams[, .(yearID,
                  lgID = as.character(lgID),
                  teamID = as.character(teamID),
                  franchID = as.character(franchID),
                  Rank, G, W, L, R, ERA, SO,
                  WinPercent = W/(W+L))]

salaries = as.data.table(Salaries)
salaries = salaries[, c("lgID", "teamID", "salary1M") :=
                      list(as.character(lgID), as.character(teamID), salary / 1e6L)]
payroll = salaries[, .(payroll = sum(salary1M)), by=.(teamID, yearID)]
teamPayroll = merge(teams, payroll, by = c("teamID", "yearID"))
ggplot(data = teamPayroll, aes(x = payroll, y = WinPercent)) + geom_point()  + labs(x = "Payroll (in millions)", y = "Win Percentage") +
  geom_smooth(method = lm, se = FALSE)

mod_lm <- lm(data = teamPayroll, WinPercent~payroll)
mod_lm

Call:
lm(formula = WinPercent ~ payroll, data = teamPayroll)

Coefficients:
(Intercept)      payroll  
  0.4796007    0.0003396  
summary(mod_lm)

Call:
lm(formula = WinPercent ~ payroll, data = teamPayroll)

Residuals:
      Min        1Q    Median        3Q       Max 
-0.230866 -0.048237 -0.000954  0.049584  0.211074 

Coefficients:
             Estimate Std. Error t value Pr(>|t|)    
(Intercept) 0.4796007  0.0037895 126.561  < 2e-16 ***
payroll     0.0003396  0.0000512   6.633 5.61e-11 ***
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 0.06714 on 916 degrees of freedom
Multiple R-squared:  0.04583,   Adjusted R-squared:  0.04479 
F-statistic:    44 on 1 and 916 DF,  p-value: 5.611e-11
payroll_pred <- teamPayroll %>%
  add_predictions(mod_lm)

payroll_pred %>%
  filter(yearID >= 2010) %>%
  arrange(desc(pred)) %>%
  head(25)
<<<<<<< HEAD ======= >>>>>>> 0a71bd239790e75b2d56eb2aeea95cd144536745
payroll_pred %>%
  filter(yearID >= 2010) %>%
  arrange(desc(WinPercent)) %>%
  head(25)
<<<<<<< HEAD ======= >>>>>>> 0a71bd239790e75b2d56eb2aeea95cd144536745

Only five teams are in the top 25 of both payroll and win percentage in the 2010s. These teams are the 2011 Phillies, 2011 Yankees, 2010 Yankees, 2012 Yankees, and 2016 Rangers. This shows that spending the most money doesn’t automatically mean you are getting the best product on the field. ## Simple Linear Regression

Multiple Linear Regression

bstats_salary <- bstats_salary %>%
  filter(PA >= 100) %>%
  filter(salary > 500000)
lm_mod <- lm(salary ~ H, HR, data = bstats_salary_21century)
summary(lm_mod)

Call:
lm(formula = salary ~ H, data = bstats_salary_21century, subset = HR)

Residuals:
     Min       1Q   Median       3Q      Max 
-4454703 -1184411  -175489   774007 14030406 

Coefficients:
             Estimate Std. Error t value Pr(>|t|)    
(Intercept) -175015.7    82216.4  -2.129   0.0333 *  
H             39604.4      661.7  59.854   <2e-16 ***
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 2299000 on 3982 degrees of freedom
Multiple R-squared:  0.4736,    Adjusted R-squared:  0.4735 
F-statistic:  3583 on 1 and 3982 DF,  p-value: < 2.2e-16
lm_mod_prd <- bstats_salary_21century %>% add_predictions(lm_mod)
lm_mod_prd
<<<<<<< HEAD ======= >>>>>>> 0a71bd239790e75b2d56eb2aeea95cd144536745
full_model <- lm(salary ~., data = bstats_salary_21century)
summary(full_model)

Call:
lm(formula = salary ~ ., data = bstats_salary_21century)

Residuals:
      Min        1Q    Median        3Q       Max 
-15323368  -1127665         0   1254066  12871792 

Coefficients: (3 not defined because of singularities)
                    Estimate Std. Error t value Pr(>|t|)    
(Intercept)       -1.286e+09  5.422e+07 -23.712  < 2e-16 ***
playerIDabreujo02 -7.317e+06  2.046e+06  -3.576 0.000354 ***
playerIDackledu01 -1.297e+07  1.806e+06  -7.180 8.68e-13 ***
playerIDadamecr01 -1.070e+07  3.117e+06  -3.432 0.000608 ***
playerIDadamsda02 -1.347e+07  3.085e+06  -4.365 1.31e-05 ***
playerIDadamsma01 -1.383e+07  1.996e+06  -6.927 5.22e-12 ***
playerIDadducji02 -1.145e+07  3.093e+06  -3.700 0.000219 ***
playerIDadriaeh01 -1.127e+07  3.099e+06  -3.637 0.000281 ***
playerIDagbaybe01 -4.126e+06  3.115e+06  -1.325 0.185362    
playerIDahmedni01 -1.344e+07  2.334e+06  -5.756 9.44e-09 ***
playerIDalfoned01 -3.760e+06  1.812e+06  -2.075 0.038056 *  
playerIDalicelu01 -4.490e+06  3.108e+06  -1.445 0.148667    
playerIDalomaro01 -2.833e+06  1.983e+06  -1.429 0.153183    
playerIDalomasa02 -5.953e+06  1.834e+06  -3.245 0.001186 ** 
playerIDalonsyo01 -1.311e+07  1.672e+06  -7.839 6.20e-15 ***
playerIDaloumo01  -2.724e+06  1.589e+06  -1.715 0.086476 .  
playerIDaltheaa01 -1.513e+07  3.080e+06  -4.913 9.45e-07 ***
playerIDaltuvjo01 -1.197e+07  2.039e+06  -5.873 4.75e-09 ***
playerIDalvarpe01 -1.057e+07  1.612e+06  -6.560 6.29e-11 ***
playerIDamarial01 -1.192e+07  2.333e+06  -5.109 3.44e-07 ***
playerIDamezaal01 -5.945e+06  3.118e+06  -1.907 0.056677 .  
playerIDanderga01 -4.053e+06  1.445e+06  -2.805 0.005058 ** 
playerIDanderma02 -5.572e+06  1.793e+06  -3.108 0.001900 ** 
playerIDandinro01 -1.112e+07  3.099e+06  -3.588 0.000338 ***
playerIDandruel01 -4.611e+06  1.710e+06  -2.696 0.007049 ** 
playerIDankieri01 -9.386e+06  1.668e+06  -5.627 1.99e-08 ***
playerIDaokino01  -1.109e+07  1.696e+06  -6.539 7.21e-11 ***
playerIDarciaos01 -1.335e+07  2.354e+06  -5.669 1.57e-08 ***
playerIDarenano01 -1.197e+07  2.365e+06  -5.062 4.40e-07 ***
playerIDarencjp01 -1.314e+07  2.327e+06  -5.647 1.78e-08 ***
playerIDariasjo01 -9.841e+06  2.351e+06  -4.187 2.91e-05 ***
playerIDascheco01 -1.435e+07  2.292e+06  -6.263 4.30e-10 ***
playerIDatkinga01 -5.761e+06  1.983e+06  -2.904 0.003706 ** 
playerIDaurilri01 -6.197e+06  1.478e+06  -4.194 2.81e-05 ***
playerIDausmubr01 -6.107e+06  1.571e+06  -3.887 0.000104 ***
playerIDavilaal01 -1.239e+07  1.689e+06  -7.333 2.85e-13 ***
playerIDavilemi01 -1.088e+07  1.596e+06  -6.819 1.10e-11 ***
playerIDaybarer01 -8.724e+06  1.537e+06  -5.676 1.50e-08 ***
playerIDaybarwi01 -9.228e+06  2.318e+06  -3.980 7.04e-05 ***
playerIDbaergca01 -5.648e+06  3.107e+06  -1.818 0.069184 .  
playerIDbaezja01  -1.390e+07  3.113e+06  -4.467 8.21e-06 ***
playerIDbagweje01  5.219e+06  1.834e+06   2.846 0.004454 ** 
playerIDbakerje03 -1.032e+07  1.803e+06  -5.725 1.14e-08 ***
playerIDbakerjo01 -1.191e+07  2.307e+06  -5.164 2.57e-07 ***
playerIDbakopa01  -6.578e+06  1.591e+06  -4.136 3.64e-05 ***
playerIDbaldero01 -7.053e+06  2.328e+06  -3.030 0.002468 ** 
playerIDbarajro01 -8.668e+06  1.511e+06  -5.737 1.06e-08 ***
playerIDbardjo01  -8.674e+06  1.973e+06  -4.396 1.14e-05 ***
playerIDbarmecl01 -8.677e+06  1.532e+06  -5.665 1.60e-08 ***
playerIDbarnebr02 -9.376e+06  2.362e+06  -3.969 7.37e-05 ***
playerIDbarneda01 -1.377e+07  1.990e+06  -6.919 5.50e-12 ***
playerIDbarnhtu01 -1.529e+07  3.098e+06  -4.934 8.48e-07 ***
playerIDbarremi01 -6.867e+06  1.544e+06  -4.447 9.02e-06 ***
playerIDbartlja01 -7.030e+06  1.972e+06  -3.565 0.000369 ***
playerIDbartoda02 -1.163e+07  2.327e+06  -4.998 6.10e-07 ***
playerIDbatisto01 -5.905e+06  1.823e+06  -3.240 0.001210 ** 
playerIDbautida01 -4.170e+06  2.006e+06  -2.079 0.037740 *  
playerIDbautijo02 -5.166e+06  1.436e+06  -3.596 0.000328 ***
playerIDbaxtemi01 -1.178e+07  3.113e+06  -3.783 0.000158 ***
playerIDbayja01   -4.753e+06  1.444e+06  -3.292 0.001007 ** 
playerIDbeckhgo01 -1.248e+07  1.686e+06  -7.403 1.71e-13 ***
playerIDbeckhti01 -1.235e+07  2.342e+06  -5.273 1.43e-07 ***
playerIDbellda01  -6.356e+06  1.658e+06  -3.834 0.000129 ***
playerIDbellhma01 -6.670e+06  2.310e+06  -2.887 0.003912 ** 
playerIDbelliro01 -7.044e+06  1.463e+06  -4.815 1.55e-06 ***
playerIDbellja01  -4.870e+06  3.139e+06  -1.551 0.120888    
playerIDbeltbr01  -1.150e+07  1.804e+06  -6.374 2.12e-10 ***
playerIDbeltrad01 -6.044e+05  1.299e+06  -0.465 0.641671    
playerIDbeltrca01  1.127e+06  1.254e+06   0.899 0.368930    
playerIDbenarma01 -5.642e+04  3.108e+06  -0.018 0.985517    
playerIDbenjami01  6.736e+05  3.145e+06   0.214 0.830387    
playerIDbennega01 -7.187e+06  1.671e+06  -4.301 1.75e-05 ***
playerIDbergda01  -5.325e+06  2.329e+06  -2.287 0.022273 *  
playerIDberkmla01 -9.742e+05  1.408e+06  -0.692 0.488961    
playerIDbernaro01 -9.117e+06  3.101e+06  -2.940 0.003311 ** 
playerIDberroan01 -7.616e+06  3.122e+06  -2.440 0.014763 *  
playerIDbetanyu01 -9.590e+06  1.496e+06  -6.409 1.69e-10 ***
playerIDbetemwi01 -1.031e+07  1.972e+06  -5.229 1.81e-07 ***
playerIDbethach01 -1.291e+07  2.309e+06  -5.591 2.46e-08 ***
playerIDbettsmo01 -1.516e+07  2.330e+06  -6.507 8.92e-11 ***
playerIDbiggicr01 -4.264e+06  1.688e+06  -2.525 0.011606 *  
playerIDblackch02 -1.079e+07  2.045e+06  -5.273 1.43e-07 ***
playerIDblakeca01 -6.557e+06  1.515e+06  -4.327 1.56e-05 ***
playerIDblaloha01 -7.270e+06  1.601e+06  -4.541 5.82e-06 ***
playerIDblancan01 -1.143e+07  1.971e+06  -5.801 7.25e-09 ***
playerIDblancgr01 -9.776e+06  1.688e+06  -5.792 7.64e-09 ***
playerIDblanche01 -7.770e+06  1.429e+06  -5.439 5.79e-08 ***
playerIDblankky01 -1.220e+07  3.090e+06  -3.949 8.02e-05 ***
playerIDbloomwi01 -8.476e+06  1.436e+06  -5.901 4.00e-09 ***
playerIDblumge01  -7.772e+06  1.486e+06  -5.231 1.80e-07 ***
playerIDboescbr01 -1.398e+07  3.090e+06  -4.524 6.29e-06 ***
playerIDbogaexa01 -1.652e+07  1.994e+06  -8.284  < 2e-16 ***
playerIDbondsba01  2.672e+06  1.995e+06   1.339 0.180526    
playerIDbonifem01 -8.885e+06  1.981e+06  -4.485 7.57e-06 ***
playerIDbooneaa01 -5.571e+06  1.580e+06  -3.525 0.000430 ***
playerIDboonebr01 -1.095e+06  1.796e+06  -0.610 0.542164    
playerIDborboju01 -8.529e+06  3.107e+06  -2.745 0.006085 ** 
playerIDbordimi01 -3.660e+06  2.305e+06  -1.588 0.112403    
playerIDbourgja01 -1.279e+07  3.101e+06  -4.124 3.82e-05 ***
playerIDbourjpe01 -1.110e+07  1.800e+06  -6.164 8.02e-10 ***
playerIDbourju01  -1.447e+07  3.142e+06  -4.607 4.26e-06 ***
playerIDbournmi01 -3.358e+06  1.585e+06  -2.119 0.034192 *  
playerIDbradlja02 -1.536e+07  1.990e+06  -7.719 1.58e-14 ***
playerIDbradlmi01 -5.041e+06  1.487e+06  -3.390 0.000708 ***
playerIDbrantmi02 -1.174e+07  2.002e+06  -5.864 4.99e-09 ***
playerIDbranyru01 -9.118e+06  1.804e+06  -5.054 4.58e-07 ***
playerIDbraunry02 -3.101e+06  1.498e+06  -2.071 0.038485 *  
playerIDbrousbe01 -5.782e+06  2.312e+06  -2.500 0.012457 *  
playerIDbrowndo01 -1.319e+07  2.285e+06  -5.771 8.66e-09 ***
playerIDbrownem01 -7.854e+06  1.973e+06  -3.981 7.03e-05 ***
playerIDbrowntr01 -1.372e+07  3.093e+06  -4.434 9.58e-06 ***
playerIDbroxtke01 -1.136e+07  3.131e+06  -3.629 0.000289 ***
playerIDbruceja01 -5.797e+06  1.624e+06  -3.569 0.000363 ***
playerIDbrunter01 -6.586e+06  2.310e+06  -2.851 0.004382 ** 
playerIDbryankr01 -1.643e+07  3.118e+06  -5.270 1.46e-07 ***
playerIDbuckjo01  -8.518e+06  1.580e+06  -5.392 7.49e-08 ***
playerIDbucktr01  -1.052e+07  3.089e+06  -3.404 0.000672 ***
playerIDburkech01 -6.977e+06  3.119e+06  -2.237 0.025357 *  
playerIDburksel01  5.976e+02  2.327e+06   0.000 0.999795    
playerIDburnije01 -2.642e+06  1.667e+06  -1.585 0.113118    
playerIDburnsbi02 -1.402e+07  3.112e+06  -4.505 6.87e-06 ***
playerIDburrepa01 -4.267e+06  1.390e+06  -3.070 0.002159 ** 
playerIDburriem01 -9.879e+06  3.101e+06  -3.186 0.001458 ** 
playerIDburrose01 -6.060e+06  3.104e+06  -1.952 0.050988 .  
playerIDbuterdr01 -1.337e+07  2.306e+06  -5.798 7.41e-09 ***
playerIDbutlebi03 -7.861e+06  1.600e+06  -4.914 9.41e-07 ***
playerIDbuxtoby01 -1.206e+07  3.122e+06  -3.864 0.000114 ***
playerIDbyrdma01  -8.936e+06  1.455e+06  -6.143 9.13e-10 ***
playerIDbyrneer01 -3.386e+06  1.680e+06  -2.015 0.043958 *  
playerIDcabreas01 -7.864e+06  1.590e+06  -4.946 7.98e-07 ***
playerIDcabreev01 -1.025e+07  1.987e+06  -5.159 2.65e-07 ***
playerIDcabrejo02 -6.823e+06  3.097e+06  -2.203 0.027646 *  
playerIDcabreme01 -6.932e+06  1.460e+06  -4.747 2.16e-06 ***
playerIDcabremi01  3.633e+06  1.434e+06   2.533 0.011350 *  
playerIDcabreor01 -6.306e+06  1.397e+06  -4.513 6.63e-06 ***
playerIDcainlo01  -1.093e+07  1.816e+06  -6.020 1.95e-09 ***
playerIDcairomi01 -7.048e+06  1.438e+06  -4.903 9.95e-07 ***
playerIDcalhoko01 -1.648e+07  1.984e+06  -8.305  < 2e-16 ***
playerIDcallaal01 -1.228e+07  1.658e+06  -7.408 1.65e-13 ***
playerIDcamermi01 -2.582e+06  1.361e+06  -1.897 0.057910 .  
playerIDcampber01 -1.480e+07  3.094e+06  -4.784 1.80e-06 ***
playerIDcanoro01  -9.624e+05  1.448e+06  -0.665 0.506314    
playerIDcantujo01 -8.545e+06  1.989e+06  -4.295 1.80e-05 ***
playerIDcarpema01 -1.379e+07  1.819e+06  -7.581 4.52e-14 ***
playerIDcarpmi01  -1.311e+07  2.326e+06  -5.636 1.89e-08 ***
playerIDcarreez01 -1.222e+07  3.107e+06  -3.933 8.59e-05 ***
playerIDcarroja01 -7.805e+06  1.474e+06  -5.294 1.28e-07 ***
playerIDcartech02 -1.340e+07  2.091e+06  -6.407 1.72e-10 ***
playerIDcasalcu01 -1.346e+07  3.104e+06  -4.335 1.50e-05 ***
playerIDcaseyse01 -4.578e+06  1.536e+06  -2.981 0.002895 ** 
playerIDcasilal01 -8.736e+06  2.329e+06  -3.751 0.000179 ***
playerIDcasteni01 -1.579e+07  2.330e+06  -6.779 1.45e-11 ***
playerIDcastijo02 -7.970e+06  2.309e+06  -3.452 0.000564 ***
playerIDcastilu01 -3.560e+06  1.461e+06  -2.437 0.014870 *  
playerIDcastiru01 -4.103e+06  3.088e+06  -1.329 0.184082    
playerIDcastivi02 -5.225e+06  1.681e+06  -3.108 0.001902 ** 
playerIDcastiwe01 -1.413e+07  1.989e+06  -7.103 1.51e-12 ***
playerIDcastrja01 -1.195e+07  2.174e+06  -5.496 4.21e-08 ***
playerIDcastrju01 -5.864e+06  1.681e+06  -3.489 0.000492 ***
playerIDcastrra01 -1.048e+07  1.808e+06  -5.795 7.53e-09 ***
playerIDcastrst01 -1.075e+07  1.691e+06  -6.355 2.39e-10 ***
playerIDcatalfr01 -5.428e+06  1.535e+06  -3.537 0.000411 ***
playerIDcedenro01 -2.235e+06  1.979e+06  -1.130 0.258746    
playerIDcedenro02 -1.033e+07  1.680e+06  -6.148 8.85e-10 ***
playerIDcervefr01 -1.367e+07  1.983e+06  -6.895 6.52e-12 ***
playerIDcespeyo01 -1.871e+06  1.673e+06  -1.118 0.263579    
playerIDchaveen01 -7.759e+06  1.812e+06  -4.282 1.91e-05 ***
playerIDchaveer01 -5.147e+06  1.385e+06  -3.716 0.000206 ***
playerIDchiriro01 -1.436e+07  2.007e+06  -7.155 1.04e-12 ***
playerIDchiselo01 -1.187e+07  2.006e+06  -5.916 3.66e-09 ***
playerIDchoicmi01 -1.371e+07  3.093e+06  -4.431 9.70e-06 ***
playerIDchoiji01  -1.608e+07  3.096e+06  -5.195 2.18e-07 ***
playerIDchoosh01  -3.947e+06  1.582e+06  -2.495 0.012630 *  
playerIDchurcry01 -9.241e+06  1.970e+06  -4.690 2.85e-06 ***
playerIDcintral01 -6.459e+06  2.327e+06  -2.775 0.005548 ** 
playerIDcirilje01 -3.909e+06  1.808e+06  -2.162 0.030685 *  
playerIDclarkbr02 -6.416e+06  2.364e+06  -2.715 0.006673 ** 
playerIDclarkto02 -5.633e+06  1.601e+06  -3.518 0.000442 ***
playerIDclaytro01 -5.493e+06  1.597e+06  -3.439 0.000591 ***
playerIDclevest01 -1.445e+07  3.106e+06  -4.651 3.45e-06 ***
playerIDcoghlch01 -1.103e+07  1.979e+06  -5.571 2.75e-08 ***
playerIDcolabch01 -1.251e+07  3.100e+06  -4.037 5.54e-05 ***
playerIDcolbrgr01 -4.381e+06  3.122e+06  -1.403 0.160729    
playerIDcollity01 -1.500e+07  3.095e+06  -4.847 1.32e-06 ***
playerIDcolonch01 -1.341e+07  2.336e+06  -5.741 1.03e-08 ***
playerIDcolvity01 -1.169e+07  3.103e+06  -3.768 0.000168 ***
playerIDconfomi01 -1.604e+07  3.090e+06  -5.193 2.21e-07 ***
playerIDcongeha01 -1.385e+07  1.986e+06  -6.976 3.69e-12 ***
playerIDconinje01 -5.492e+06  1.592e+06  -3.450 0.000567 ***
playerIDcoomero01 -6.133e+06  3.094e+06  -1.982 0.047572 *  
playerIDcoraal01  -7.491e+06  1.430e+06  -5.237 1.74e-07 ***
playerIDcordewi01 -9.184e+06  3.186e+06  -2.883 0.003972 ** 
playerIDcordoma01 -4.748e+06  3.099e+06  -1.532 0.125592    
playerIDcorpoca01 -1.390e+07  2.353e+06  -5.910 3.80e-09 ***
playerIDcorreca01 -1.652e+07  3.195e+06  -5.170 2.48e-07 ***
playerIDcounscr01 -5.881e+06  1.412e+06  -4.166 3.19e-05 ***
playerIDcowgico01 -1.388e+07  3.088e+06  -4.494 7.26e-06 ***
playerIDcozarza01 -1.343e+07  2.015e+06  -6.665 3.13e-11 ***
playerIDcraigal01 -1.232e+07  2.430e+06  -5.070 4.22e-07 ***
playerIDcrawfbr01 -1.262e+07  1.821e+06  -6.932 5.04e-12 ***
 [ reached getOption("max.print") -- omitted 858 rows ]
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 2889000 on 3072 degrees of freedom
Multiple R-squared:  0.7694,    Adjusted R-squared:  0.6903 
F-statistic: 9.724 on 1054 and 3072 DF,  p-value: < 2.2e-16
full_model_pred <- bstats_sure %>% add_predictions(full_model)
full_model_pred
<<<<<<< HEAD ======= >>>>>>> 0a71bd239790e75b2d56eb2aeea95cd144536745
adv_stat_mod <- lm(salary ~ OPS, data = bstats_salary_21century)
summary(adv_stat_mod)

Call:
lm(formula = salary ~ OPS, data = bstats_salary_21century)

Residuals:
      Min        1Q    Median        3Q       Max 
-10237320  -3222583  -1313128   1912953  26166519 

Coefficients:
            Estimate Std. Error t value Pr(>|t|)    
(Intercept) -7241235     498661  -14.52   <2e-16 ***
OPS         16617138     664556   25.00   <2e-16 ***
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 4837000 on 4125 degrees of freedom
Multiple R-squared:  0.1316,    Adjusted R-squared:  0.1314 
F-statistic: 625.2 on 1 and 4125 DF,  p-value: < 2.2e-16

Resampling Methods

#including 2002 and up because salary becomes higher
bstats_salary_21century <- bstats_salary %>%
  filter(yearID >= 2002)
bstats_salary_21century %>% head(10)
<<<<<<< HEAD ======= >>>>>>> 0a71bd239790e75b2d56eb2aeea95cd144536745
# setting seed to generate a reproducible random sampling
set.seed(123)
 
# defining training control as cross-validation and value of K equal to 10
train_control <- trainControl(method = "cv",
                              number = 10)

# training the model
model <- train(salary ~ OBP, data = bstats_salary_21century,
               method = "lm",
               trControl = train_control)

print(model)
Linear Regression 

4127 samples
   1 predictor

No pre-processing
Resampling: Cross-Validated (10 fold) 
Summary of sample sizes: 3712, 3714, 3713, 3715, 3715, 3715, ... 
Resampling results:

  RMSE     Rsquared   MAE    
  4903905  0.1069253  3691779

Tuning parameter 'intercept' was held constant at a value of TRUE

Feature Selection

bstats_salary_numvars <- bstats_salary_21century %>% 
  select(c(6:32))
#Correlation mapping 

#making correlation heat map 
corr_numeric <- round(cor(bstats_salary_numvars), 1)

#plot to visualize the correlations 
ggcorrplot(corr_numeric,
           type = "lower",
           lab = TRUE, 
           lab_size = 2,  
           colors = c("tomato2", "white", "springgreen3"),
           title="Correlogram of batting Data", 
           ggtheme=theme_bw)

regfit.full = regsubsets(salary ~., data = bstats_salary_numvars,  nvmax = 13, method="exhaustive")
3  linear dependencies found
Reordering variables and trying again:
summary(regfit.full)
Subset selection object
Call: regsubsets.formula(salary ~ ., data = bstats_salary_numvars, 
    nvmax = 13, method = "exhaustive")
26 Variables  (and intercept)
           Forced in Forced out
G              FALSE      FALSE
AB             FALSE      FALSE
R              FALSE      FALSE
H              FALSE      FALSE
X2B            FALSE      FALSE
X3B            FALSE      FALSE
HR             FALSE      FALSE
RBI            FALSE      FALSE
SB             FALSE      FALSE
CS             FALSE      FALSE
BB             FALSE      FALSE
SO             FALSE      FALSE
IBB            FALSE      FALSE
HBP            FALSE      FALSE
SH             FALSE      FALSE
SF             FALSE      FALSE
GIDP           FALSE      FALSE
BA             FALSE      FALSE
SlugPct        FALSE      FALSE
OBP            FALSE      FALSE
BABIP          FALSE      FALSE
K_Percent      FALSE      FALSE
BB_Percent     FALSE      FALSE
PA             FALSE      FALSE
TB             FALSE      FALSE
OPS            FALSE      FALSE
1 subsets of each size up to 14
Selection Algorithm: exhaustive
          G   AB  R   H   X2B X3B HR  RBI SB  CS  BB  SO  IBB HBP SH  SF  GIDP BA  PA  TB  SlugPct OBP OPS BABIP
1  ( 1 )  " " " " " " " " " " " " " " "*" " " " " " " " " " " " " " " " " " "  " " " " " " " "     " " " " " "  
2  ( 1 )  " " " " " " " " " " " " " " "*" " " " " " " " " " " " " " " " " " "  " " " " " " " "     " " " " " "  
3  ( 1 )  "*" " " " " " " " " " " " " " " " " " " " " " " " " " " "*" " " " "  " " "*" " " " "     " " " " " "  
4  ( 1 )  "*" " " " " " " " " " " " " " " " " " " " " " " "*" " " "*" " " " "  " " "*" " " " "     " " " " " "  
5  ( 1 )  "*" " " " " " " " " "*" " " " " " " " " " " " " "*" " " "*" " " " "  " " "*" " " " "     " " " " " "  
6  ( 1 )  "*" " " " " " " "*" "*" " " " " " " " " " " " " "*" " " "*" " " " "  " " "*" " " " "     " " " " " "  
7  ( 1 )  "*" " " " " " " "*" "*" " " " " " " " " " " " " "*" " " "*" " " " "  " " "*" " " " "     " " "*" " "  
8  ( 1 )  "*" " " " " " " "*" "*" " " " " " " " " " " " " "*" " " "*" " " "*"  " " "*" " " " "     " " "*" " "  
9  ( 1 )  "*" " " " " " " "*" "*" " " " " " " " " " " " " "*" " " "*" " " "*"  " " "*" " " "*"     " " " " " "  
10  ( 1 ) "*" " " " " " " "*" "*" " " " " " " " " " " " " "*" " " "*" " " "*"  " " "*" " " "*"     " " " " " "  
11  ( 1 ) "*" " " " " " " "*" "*" " " " " "*" "*" " " " " "*" " " "*" " " "*"  " " "*" " " "*"     " " " " " "  
12  ( 1 ) "*" " " " " " " "*" "*" " " " " "*" "*" " " " " "*" " " "*" " " "*"  " " "*" " " "*"     " " " " " "  
13  ( 1 ) "*" " " " " " " "*" "*" " " "*" "*" "*" " " "*" "*" " " "*" " " "*"  " " "*" " " "*"     " " " " " "  
14  ( 1 ) "*" "*" " " " " "*" "*" "*" "*" "*" "*" "*" " " "*" " " "*" " " "*"  " " " " " " " "     " " "*" "*"  
          K_Percent BB_Percent
1  ( 1 )  " "       " "       
2  ( 1 )  " "       "*"       
3  ( 1 )  " "       " "       
4  ( 1 )  " "       " "       
5  ( 1 )  " "       " "       
6  ( 1 )  " "       " "       
7  ( 1 )  " "       " "       
8  ( 1 )  " "       " "       
9  ( 1 )  " "       "*"       
10  ( 1 ) "*"       "*"       
11  ( 1 ) " "       "*"       
12  ( 1 ) "*"       "*"       
13  ( 1 ) " "       "*"       
14  ( 1 ) " "       " "       
summary(regfit.full)$rsq
 [1] 0.1735921 0.1997069 0.2379362 0.2627538 0.2763364 0.2820003 0.2891514 0.2937692 0.2962186 0.2979275 0.2997391
[12] 0.3013596 0.3020423 0.3031258
plot(summary(regfit.full)$rsq)

reg.summary <- summary(regfit.full) #get the summary

par(mfrow=c(2,2))
#rss plot -  NOT USEFUL
plot(reg.summary$rss ,xlab="Number of Variables ",ylab="RSS",type="l")

#adjr2 plot
plot(reg.summary$adjr2 ,xlab="Number of Variables ", ylab="Adjusted RSq",type="l")

max_adjr2 <- which.max(reg.summary$adjr2)
points(max_adjr2,reg.summary$adjr2[max_adjr2], col="red",cex=2,pch=20)

# AIC criterion (Cp) to minimize
plot(reg.summary$cp ,xlab="Number of Variables ",ylab="Cp", type='l')

min_cp <- which.min(reg.summary$cp )
points(min_cp, reg.summary$cp[min_cp],col="red",cex=2,pch=20)

# BIC criterion to minimize
plot(reg.summary$bic ,xlab="Number of Variables ",ylab="BIC",type='l')

min_bic <- which.min(reg.summary$bic)
points(min_bic,reg.summary$bic[min_bic],col="red",cex=2,pch=20)

#Forward stepwise selection
regfit.fwd = regsubsets(salary ~. , data=bstats_salary_numvars, nvmax=13, method ="forward")
3  linear dependencies found
Reordering variables and trying again:
summary(regfit.fwd)
Subset selection object
Call: regsubsets.formula(salary ~ ., data = bstats_salary_numvars, 
    nvmax = 13, method = "forward")
26 Variables  (and intercept)
           Forced in Forced out
G              FALSE      FALSE
AB             FALSE      FALSE
R              FALSE      FALSE
H              FALSE      FALSE
X2B            FALSE      FALSE
X3B            FALSE      FALSE
HR             FALSE      FALSE
RBI            FALSE      FALSE
SB             FALSE      FALSE
CS             FALSE      FALSE
BB             FALSE      FALSE
SO             FALSE      FALSE
IBB            FALSE      FALSE
HBP            FALSE      FALSE
SH             FALSE      FALSE
SF             FALSE      FALSE
GIDP           FALSE      FALSE
BA             FALSE      FALSE
SlugPct        FALSE      FALSE
OBP            FALSE      FALSE
BABIP          FALSE      FALSE
K_Percent      FALSE      FALSE
BB_Percent     FALSE      FALSE
PA             FALSE      FALSE
TB             FALSE      FALSE
OPS            FALSE      FALSE
1 subsets of each size up to 14
Selection Algorithm: forward
          G   AB  R   H   X2B X3B HR  RBI SB  CS  BB  SO  IBB HBP SH  SF  GIDP BA  PA  TB  SlugPct OBP OPS BABIP
1  ( 1 )  " " " " " " " " " " " " " " "*" " " " " " " " " " " " " " " " " " "  " " " " " " " "     " " " " " "  
2  ( 1 )  " " " " " " " " " " " " " " "*" " " " " " " " " " " " " " " " " " "  " " " " " " " "     " " " " " "  
3  ( 1 )  "*" " " " " " " " " " " " " "*" " " " " " " " " " " " " " " " " " "  " " " " " " " "     " " " " " "  
4  ( 1 )  "*" "*" " " " " " " " " " " "*" " " " " " " " " " " " " " " " " " "  " " " " " " " "     " " " " " "  
5  ( 1 )  "*" "*" " " " " " " "*" " " "*" " " " " " " " " " " " " " " " " " "  " " " " " " " "     " " " " " "  
6  ( 1 )  "*" "*" " " " " " " "*" " " "*" " " " " " " " " " " " " "*" " " " "  " " " " " " " "     " " " " " "  
7  ( 1 )  "*" "*" " " " " "*" "*" " " "*" " " " " " " " " " " " " "*" " " " "  " " " " " " " "     " " " " " "  
8  ( 1 )  "*" "*" " " " " "*" "*" " " "*" " " " " " " " " " " " " "*" " " "*"  " " " " " " " "     " " " " " "  
9  ( 1 )  "*" "*" " " " " "*" "*" " " "*" " " " " " " " " "*" " " "*" " " "*"  " " " " " " " "     " " " " " "  
10  ( 1 ) "*" "*" " " " " "*" "*" " " "*" " " " " " " " " "*" " " "*" " " "*"  " " " " " " " "     " " " " " "  
11  ( 1 ) "*" "*" "*" " " "*" "*" " " "*" " " " " " " " " "*" " " "*" " " "*"  " " " " " " " "     " " " " " "  
12  ( 1 ) "*" "*" "*" " " "*" "*" " " "*" " " "*" " " " " "*" " " "*" " " "*"  " " " " " " " "     " " " " " "  
13  ( 1 ) "*" "*" "*" " " "*" "*" " " "*" "*" "*" " " " " "*" " " "*" " " "*"  " " " " " " " "     " " " " " "  
14  ( 1 ) "*" "*" "*" " " "*" "*" " " "*" "*" "*" "*" " " "*" " " "*" " " "*"  " " " " " " " "     " " " " " "  
          K_Percent BB_Percent
1  ( 1 )  " "       " "       
2  ( 1 )  " "       "*"       
3  ( 1 )  " "       "*"       
4  ( 1 )  " "       "*"       
5  ( 1 )  " "       "*"       
6  ( 1 )  " "       "*"       
7  ( 1 )  " "       "*"       
8  ( 1 )  " "       "*"       
9  ( 1 )  " "       "*"       
10  ( 1 ) "*"       "*"       
11  ( 1 ) "*"       "*"       
12  ( 1 ) "*"       "*"       
13  ( 1 ) "*"       "*"       
14  ( 1 ) "*"       "*"       
reg.summary <- summary(regfit.fwd) #get the summary

par(mfrow=c(2,2))
#rss plot -  NOT USEFUL
plot(reg.summary$rss ,xlab="Number of Variables ",ylab="RSS",type="l")

#adjr2 plot
plot(reg.summary$adjr2 ,xlab="Number of Variables ", ylab="Adjusted RSq",type="l")

max_adjr2 <- which.max(reg.summary$adjr2)
points(max_adjr2,reg.summary$adjr2[max_adjr2], col="red",cex=2,pch=20)

# AIC criterion (Cp) to minimize
plot(reg.summary$cp ,xlab="Number of Variables ",ylab="Cp", type='l')

min_cp <- which.min(reg.summary$cp )
points(min_cp, reg.summary$cp[min_cp],col="red",cex=2,pch=20)

# BIC criterion to minimize
plot(reg.summary$bic ,xlab="Number of Variables ",ylab="BIC",type='l')

min_bic <- which.min(reg.summary$bic)
points(min_bic,reg.summary$bic[min_bic],col="red",cex=2,pch=20)

#Backwards stepwise selection
regfit.bwd = regsubsets(salary ~. , data=bstats_salary_numvars,nvmax=13, method ="backward")
3  linear dependencies found
Reordering variables and trying again:
summary(regfit.bwd)
Subset selection object
Call: regsubsets.formula(salary ~ ., data = bstats_salary_numvars, 
    nvmax = 13, method = "backward")
26 Variables  (and intercept)
           Forced in Forced out
G              FALSE      FALSE
AB             FALSE      FALSE
R              FALSE      FALSE
H              FALSE      FALSE
X2B            FALSE      FALSE
X3B            FALSE      FALSE
HR             FALSE      FALSE
RBI            FALSE      FALSE
SB             FALSE      FALSE
CS             FALSE      FALSE
BB             FALSE      FALSE
SO             FALSE      FALSE
IBB            FALSE      FALSE
HBP            FALSE      FALSE
SH             FALSE      FALSE
SF             FALSE      FALSE
GIDP           FALSE      FALSE
BA             FALSE      FALSE
SlugPct        FALSE      FALSE
OBP            FALSE      FALSE
BABIP          FALSE      FALSE
K_Percent      FALSE      FALSE
BB_Percent     FALSE      FALSE
PA             FALSE      FALSE
TB             FALSE      FALSE
OPS            FALSE      FALSE
1 subsets of each size up to 14
Selection Algorithm: backward
          G   AB  R   H   X2B X3B HR  RBI SB  CS  BB  SO  IBB HBP SH  SF  GIDP BA  PA  TB  SlugPct OBP OPS BABIP
1  ( 1 )  " " " " " " " " " " " " " " " " " " " " "*" " " " " " " " " " " " "  " " " " " " " "     " " " " " "  
2  ( 1 )  " " "*" " " " " " " " " " " " " " " " " "*" " " " " " " " " " " " "  " " " " " " " "     " " " " " "  
3  ( 1 )  "*" "*" " " " " " " " " " " " " " " " " "*" " " " " " " " " " " " "  " " " " " " " "     " " " " " "  
4  ( 1 )  "*" "*" " " " " " " " " " " " " " " " " "*" " " " " " " "*" " " " "  " " " " " " " "     " " " " " "  
5  ( 1 )  "*" "*" " " " " " " "*" " " " " " " " " "*" " " " " " " "*" " " " "  " " " " " " " "     " " " " " "  
6  ( 1 )  "*" "*" " " " " " " "*" " " " " " " " " "*" " " "*" " " "*" " " " "  " " " " " " " "     " " " " " "  
7  ( 1 )  "*" "*" " " " " " " "*" " " " " " " " " "*" " " "*" " " "*" " " "*"  " " " " " " " "     " " " " " "  
8  ( 1 )  "*" "*" " " " " "*" "*" " " " " " " " " "*" " " "*" " " "*" " " "*"  " " " " " " " "     " " " " " "  
9  ( 1 )  "*" "*" " " " " "*" "*" " " " " " " " " "*" " " "*" " " "*" " " "*"  " " " " " " "*"     " " " " " "  
10  ( 1 ) "*" "*" " " " " "*" "*" " " " " " " "*" "*" " " "*" " " "*" " " "*"  " " " " " " "*"     " " " " " "  
11  ( 1 ) "*" "*" " " " " "*" "*" " " " " "*" "*" "*" " " "*" " " "*" " " "*"  " " " " " " "*"     " " " " " "  
12  ( 1 ) "*" "*" " " " " "*" "*" " " "*" "*" "*" "*" " " "*" " " "*" " " "*"  " " " " " " "*"     " " " " " "  
13  ( 1 ) "*" "*" " " " " "*" "*" "*" "*" "*" "*" "*" " " "*" " " "*" " " "*"  " " " " " " "*"     " " " " " "  
14  ( 1 ) "*" "*" " " " " "*" "*" "*" "*" "*" "*" "*" " " "*" " " "*" " " "*"  " " " " " " "*"     " " " " "*"  
          K_Percent BB_Percent
1  ( 1 )  " "       " "       
2  ( 1 )  " "       " "       
3  ( 1 )  " "       " "       
4  ( 1 )  " "       " "       
5  ( 1 )  " "       " "       
6  ( 1 )  " "       " "       
7  ( 1 )  " "       " "       
8  ( 1 )  " "       " "       
9  ( 1 )  " "       " "       
10  ( 1 ) " "       " "       
11  ( 1 ) " "       " "       
12  ( 1 ) " "       " "       
13  ( 1 ) " "       " "       
14  ( 1 ) " "       " "       
reg.summary <- summary(regfit.bwd) #get the summary

par(mfrow=c(2,2))
#rss plot -  NOT USEFUL
plot(reg.summary$rss ,xlab="Number of Variables ",ylab="RSS",type="l")

#adjr2 plot
plot(reg.summary$adjr2 ,xlab="Number of Variables ", ylab="Adjusted RSq",type="l")

max_adjr2 <- which.max(reg.summary$adjr2)
points(max_adjr2, reg.summary$adjr2[max_adjr2], col="red", cex=2, pch=20)

# AIC criterion (Cp) to minimize
plot(reg.summary$cp ,xlab="Number of Variables ",ylab="Cp", type='l')

min_cp <- which.min(reg.summary$cp )
points(min_cp, reg.summary$cp[min_cp], col="red", cex=2, pch=20)

# BIC criterion to minimize
plot(reg.summary$bic, xlab="Number of Variables ", ylab="BIC", type='l')

min_bic <- which.min(reg.summary$bic)
points(min_bic, reg.summary$bic[min_bic], col="red", cex=2, pch=20)

#ridge regression 

# getting the predictors
x_var <- bstats_salary_numvars %>% select(-salary) %>% as.matrix()
# getting the independent variable
y_var <- bstats_salary_numvars[,"salary"]
ridge <- glmnet(x_var, y_var, alpha=0)
summary(ridge)
          Length Class     Mode   
a0         100   -none-    numeric
beta      2600   dgCMatrix S4     
df         100   -none-    numeric
dim          2   -none-    numeric
lambda     100   -none-    numeric
dev.ratio  100   -none-    numeric
nulldev      1   -none-    numeric
npasses      1   -none-    numeric
jerr         1   -none-    numeric
offset       1   -none-    logical
call         4   -none-    call   
nobs         1   -none-    numeric
cv_ridge <- cv.glmnet(x_var, y_var, alpha = 0)
cv_ridge

Call:  cv.glmnet(x = x_var, y = y_var, alpha = 0) 

Measure: Mean-Squared Error 

     Lambda Index   Measure        SE Nonzero
min  216221   100 1.919e+13 5.986e+11      26
1se 1051399    83 1.976e+13 6.505e+11      26
plot(cv_ridge)

cv_ridge$lambda.min
[1] 216221.5
cv_ridge$lambda.1se
[1] 1051399
lbs_fun <- function(fit, offset_x=1, ...) {
  L <- length(fit$lambda)
  x <- log(fit$lambda[L]) + offset_x
  y <- fit$beta[ ,L]
  labs <- names(y)
  text(x, y, labels=labs, ...)
}

plot(ridge, xvar = "lambda", label=T)
lbs_fun(ridge) # add namnes

abline(v = log(cv_ridge$lambda.min), col = "red", lty=2) #lambda.min
abline(v = log(cv_ridge$lambda.1se), col="blue", lty=2)  #lambda.1se

min_ridge <- glmnet(x_var, y_var, alpha=0, lambda = cv_ridge$lambda.min)
coef(min_ridge)
27 x 1 sparse Matrix of class "dgCMatrix"
                      s0
(Intercept)  3250721.298
G             -58444.324
AB              6525.990
R              18080.066
H              13278.220
X2B           -69523.006
X3B          -242522.624
HR            -18087.206
RBI            13495.290
SB             36983.072
CS           -135994.183
BB             21055.638
SO              5972.853
IBB            85143.276
HBP           -15492.692
SH           -240184.732
SF             25292.413
GIDP           96266.785
BA           4307633.443
PA              5100.777
TB              1191.386
SlugPct      1694540.697
OBP          2293477.173
OPS          1307566.357
BABIP       -9978065.658
K_Percent   -2726576.999
BB_Percent   7042279.208
# Make predictions on the test data
predictions <- min_ridge %>% predict(x_var) %>% as.vector()

# Model performance metrics
data.frame(
  RMSE = RMSE(predictions, y_var),
  Rsquare = R2(predictions, y_var)
)
<<<<<<< HEAD ======= >>>>>>> 0a71bd239790e75b2d56eb2aeea95cd144536745
# Lasso 

# getting the predictors
x_var <- bstats_salary_numvars %>% select(-salary) %>% as.matrix()
# getting the independent variable
y_var <- bstats_salary_numvars[,"salary"]
lasso <- glmnet(x_var, y_var, alpha=1)
summary(lasso)
          Length Class     Mode   
a0          93   -none-    numeric
beta      2418   dgCMatrix S4     
df          93   -none-    numeric
dim          2   -none-    numeric
lambda      93   -none-    numeric
dev.ratio   93   -none-    numeric
nulldev      1   -none-    numeric
npasses      1   -none-    numeric
jerr         1   -none-    numeric
offset       1   -none-    logical
call         4   -none-    call   
nobs         1   -none-    numeric
cv_lasso <- cv.glmnet(x_var, y_var, alpha = 1)
cv_lasso

Call:  cv.glmnet(x = x_var, y = y_var, alpha = 1) 

Measure: Mean-Squared Error 

    Lambda Index   Measure        SE Nonzero
min   4245    68 1.899e+13 6.269e+11      20
1se  91445    35 1.956e+13 6.738e+11      17
plot(cv_lasso)

lbs_fun <- function(fit, offset_x=1, ...) {
  L <- length(fit$lambda)
  x <- log(fit$lambda[L])+ offset_x
  y <- fit$beta[, L]
  labs <- names(y)
  text(x, y, labels=labs, ...)
}
plot(lasso, xvar = "lambda", label=T)
lbs_fun(lasso)

abline(v=log(cv_lasso$lambda.min), col = "red", lty=2)
abline(v=log(cv_lasso$lambda.1se), col="blue", lty=2)

min_lasso <- glmnet(x_var, y_var, alpha=1, lambda = cv_lasso$lambda.min)
coef(min_lasso)
27 x 1 sparse Matrix of class "dgCMatrix"
                      s0
(Intercept)  2264368.199
G             -87629.654
AB             24232.612
R              18771.351
H                  .    
X2B          -107459.897
X3B          -280673.479
HR            -57743.509
RBI            20863.414
SB             33703.191
CS           -150540.856
BB             28671.666
SO                 .    
IBB            99202.779
HBP            -8281.984
SH           -238325.444
SF             19061.264
GIDP           87321.414
BA                 .    
PA              1860.331
TB             -1044.547
SlugPct      4865101.358
OBP                .    
OPS          2765165.903
BABIP       -6624249.070
K_Percent   -1340986.372
BB_Percent   7490373.836
se_lasso <- glmnet(x_var, y_var, alpha=1, lambda = cv_lasso$lambda.1se)
coef(se_lasso)
27 x 1 sparse Matrix of class "dgCMatrix"
                      s0
(Intercept)  3242070.189
G             -50386.031
AB              9548.952
R              12602.471
H                  .    
X2B            -8338.434
X3B          -168194.535
HR              9621.891
RBI            15185.753
SB              4485.584
CS            -39631.941
BB             29452.924
SO                 .    
IBB            83501.590
HBP                .    
SH           -218512.738
SF                 .    
GIDP           86598.503
BA                 .    
PA              1625.492
TB                 .    
SlugPct            .    
OBP                .    
OPS           477409.136
BABIP              .    
K_Percent   -2789571.448
BB_Percent   5662137.375
# Make predictions on the test data
predictions <- min_lasso %>% predict(x_var) %>% as.vector()
# Model performance metrics
data.frame(
  RMSE = RMSE(predictions, y_var),
  Rsquare = R2(predictions, y_var)
)
<<<<<<< HEAD ======= >>>>>>> 0a71bd239790e75b2d56eb2aeea95cd144536745

Salary Data

franchise <- c(`ANA` = "LAA", `ARI` = "ARI", `ATL` = "ATL", 
               `BAL` = "BAL", `BOS` = "BOS", `CAL` = "LAA",
               `CHA` = "CHA", `CHN` = "CHN", `CIN` = "CIN", 
               `CLE` = "CLE", `COL` = "COL", `DET` = "DET", 
               `FLO` = "MIA", `HOU` = "HOU", `KCA` = "KCA", 
               `LAA` = "LAA", `LAN` = "LAN", `MIA` = "MIA", 
               `MIL` = "MIL", `MIN` = "MIN", `ML4` = "MIL", 
               `MON` = "WAS", `NYA` = "NYA", `NYM` = "NYN", 
               `NYN` = "NYN", `OAK` = "OAK", `PHI` = "PHI", 
               `PIT` = "PIT", `SDN` = "SDN", `SEA` = "SEA",
               `SFG` = "SFN", `SFN` = "SFN", `SLN` = "SLN", 
               `TBA` = "TBA", `TEX` = "TEX", `TOR` = "TOR",
               `WAS` = "WAS")
Salaries$franchise <- unname(franchise[Salaries$teamID])
avg_team_salaries <- Salaries %>%
    group_by(yearID, franchise, lgID) %>%
    summarise(salary = mean(salary)/1e6) %>%
    filter(!(franchise == "CLE" & lgID == "NL"))
`summarise()` has grouped output by 'yearID', 'franchise'. You can override using the `.groups` argument.
ggplot(avg_team_salaries, 
       aes(x = yearID, y = salary, group = factor(franchise))) +
       geom_path() +
       labs(x = "Year", y = "Average team salary (millions USD)")
<<<<<<< HEAD

=======

>>>>>>> 0a71bd239790e75b2d56eb2aeea95cd144536745
ggplot(Salaries, aes(x = factor(yearID), y = salary/1e5)) +
   geom_boxplot(fill = "lightblue", outlier.size = 1) +
   labs(x = "Year", y = "Salary (per $1,000,000)") +
   coord_flip()
<<<<<<< HEAD

=======

>>>>>>> 0a71bd239790e75b2d56eb2aeea95cd144536745
avg_team_salaries1 <- Salaries %>%
    group_by(yearID, franchise, lgID) %>%
    summarise(salary= mean(salary)/1e6) %>%
    filter(!(franchise == "CLE" & lgID == "NL")) %>%
    filter(yearID >= 2002)
`summarise()` has grouped output by 'yearID', 'franchise'. You can override using the `.groups` argument.
avg_team_salaries1 %>%
  arrange(desc(salary))
<<<<<<< HEAD ======= >>>>>>> 0a71bd239790e75b2d56eb2aeea95cd144536745
ggplot(avg_team_salaries1, aes(x = franchise, y = salary)) +
  geom_bar(stat = "identity") +
  labs(x = "Team", y = "Salary (per $100,000)")

ggplot(avg_team_salaries1, aes(x = franchise, y = salary, fill = franchise)) +
   geom_boxplot(outlier.size = 1) +
   labs(x = "Year", y = "Average Team Salary Since 2002 (per $10,000,000)") +
   coord_flip()
<<<<<<< HEAD

=======

>>>>>>> 0a71bd239790e75b2d56eb2aeea95cd144536745
<<<<<<< HEAD
---
title: "R Notebook"
output: html_notebook
editor_options: 
  chunk_output_type: inline
---

```{r}
rm(list = ls())

library(Lahman)
library(mosaic)
library(tidyr)
library(tidyverse)
library(dplyr)
library(mplot)
library(ggplot2)
library(cluster)
library(factoextra)
library(corrplot)
library(data.table)
library(mod)
library(modelr)
library(leaps)
library(caret)
library(ISLR2)
library(glmnet)
```

```{r}
#Load in People, Batting, and Pitching Dataframes
data("People") 
data("Batting")
data("Pitching")
```

```{r}
#Merges player name to Batting data. 
bstats <- battingStats()
	str(bstats)
	

People$name <- paste(People$nameFirst, People$nameLast, sep = " ")

batting_name <- merge(Batting,
                 People[,c("playerID", "name")],
                 by = "playerID", all.x = TRUE)

#Merges player name to Pitching data.

People$name <- paste(People$nameFirst, People$nameLast, sep = " ")

pitching_name <- merge(Pitching,
                 People[,c("playerID", "name")],
                 by = "playerID", all.x = TRUE)
```

```{r}
#Creating additional stats for bstats
bstats[is.na(bstats)] = 0
#is.nan(bstats)

bstats <- bstats %>%
  mutate(K_Percent = SO / PA) %>%
  mutate(BB_Percent = (BB + IBB) / PA) %>%
  mutate_all(~replace(., is.nan(.), 0))

```

```{r}
bstats <- bstats %>%
  mutate_at(vars(K_Percent, BB_Percent), funs(round(., 3)))
```

```{r}
bstats_salary <- bstats %>%
              filter(yearID >= 1985) %>%
              left_join(select(Salaries, playerID, yearID, teamID, salary), 
                         by=c("playerID", "yearID", "teamID"))

bstats_salary[is.na(bstats_salary)] = 0
str(bstats_salary)

```

```{r}
bstats_sure <- bstats_salary %>%
  filter(PA > 150) %>%
  select(OPS, BABIP, K_Percent, BB_Percent, salary)
```

## Data Preparation (Lesson 1 & 2)

```{r}
#Keep players with over 150 at bats. (We can change this value if necessary).
#Creating batting average variable.

batting1 <- bstats %>%
  filter(AB >= 150)
  
```

```{r}
bstats %>%
  filter(playerID == "bogaexa01")
```

## Exploratory Analysis (Lesson 1 & 2)
Lessons 1 and 2 will just be parts of the overall project. Simple things like data manipulation, apply functions, boxplots, etc. This will be data preparation items and exploratory analysis.

```{r}
b <- ggplot(batting1, aes(x = teamID, y = HR)) +
  geom_boxplot(col = "black", aes(fill = teamID))
b

```

```{r}
hitters1 <- batting1 %>%
  filter(yearID < 1895) %>%
  select(SlugPct)

hitters2 <- batting1 %>%
  filter(yearID > 1894, yearID < 1921) %>%
  select(SlugPct)

hitters3 <- batting1 %>%
  filter(yearID > 1920, yearID < 1969) %>%
  select(SlugPct)

hitters4 <- batting1 %>%
  filter(yearID > 1969) %>%
  select(SlugPct)
#Organizing 4 different datasets looking at slugging percentage for the following boxplots. All of these are somewhat different eras, with the most dramatic split being from before 1920 (pre-Babe Ruth) and after 1920 (during and post-Babe Ruth)
```

```{r}
boxplot(hitters1,
        main = "Slugging percentage from late 1871 - 1894",
        ylab = "Slugging percentage",
        col = "blue",
        horizontal = TRUE)
```

```{r}
boxplot(hitters2, 
        main = "Slugging percentage from 1895-1920",
        ylab = "Slugging percentage",
        col = "yellow",
        horizontal = TRUE)
```

```{r}
boxplot(hitters3, 
        main = "Slugging percentage from 1921-1968",
        ylab = "Slugging percentage",
        col = "red",
        horizontal = TRUE)
```

```{r}
boxplot(hitters4, 
        main = "Slugging percentage from 1969 - present",
        ylab = "Slugging percentage",
        col = "red",
        horizontal = TRUE)
```


```{r}
sapply(hitters1, mean, na.rm = T)
sapply(hitters2, mean, na.rm = T)
sapply(hitters3, mean, na.rm = T)
sapply(hitters4, mean, na.rm = T)
#Notice that gigantic increase between hitters2 and hitters3
```

```{r}
summary(hitters1)
```

```{r}
summary(hitters2)
```

```{r}
summary(hitters3)
```

```{r}
summary(hitters4)
```

```{r}
#Keep batting stats that we want for pairs.
batting_num <- bstats %>%
  filter(PA >= 150) %>%
  select("BA", 'OBP', 'SlugPct', "SO", "BB", "HR")
  
```

```{r}
pairs(batting_num)
```
#### Career Batting Stats
```{r}
careerBatting <- na.omit(bstats)
```

```{r}
careerBatting <- careerBatting %>%
  select(playerID, BA, PA, SlugPct, OBP, SO, HR) %>%
  group_by(playerID) %>%
  summarise_all('mean')
```

```{r}
careerBatting_num <- careerBatting %>%
  filter(PA >= 150) %>%
  select(BA, PA, SlugPct, OBP, SO, HR)

pairs(careerBatting_num)
```
```{r}
corrmatrix <- cor(batting_num)
corrplot(corrmatrix, method = 'number') #Gives us correlation from pairs graph.
```

```{r}
careerBatting_num1 <- careerBatting_num %>%
  filter(PA > 500)
```


## 0-dimensional Reduction (Lesson 4)


#### Bootstrapping

## PCA (Lesson 4)
```{r}
res <- batting_num %>% prcomp(scale = TRUE)
res
```

```{r}
loadings <- res$rotation
loadings
```

```{r}
score_mat <- res$x
score_mat
```


```{r}
get_eig(res)
```

#### Screeplot
```{r}
get_eig(res) %>%
  ggplot(aes(x = 1:6, y = cumulative.variance.percent)) +
  geom_line() +
  geom_point() +
  geom_hline(yintercept = 80) +
  xlab("Principal Component") +
  ylab("Proportion of Variance Explained") +
  ggtitle("Scree Plot of Principal Component for Batting Statistics")
```

2 Principal Components: PC1 and PC2

```{r}
fviz_screeplot(res, main = "Scree Plot")
```

Can Identify an elbow in 3.

#### Biplot
```{r}
res %>%
  fviz_pca_var(axes = c(1,2),
               col.var = "contrib",
               gradient.cols = c("#00AFBB", "#E7B800", "#FC4E07"),
               repel = TRUE
               )
```


## Cluster Analysis (Lesson 5)
```{r}
#NOT COMPLETE!!!!! This was just a test, bstats is way too big.
bstats_best <- bstats %>%
  filter(PA >= 600)

eu_dist <- get_dist(careerBatting_num1, method = 'euclidean')
```

```{r}
hc_complete <- hclust(eu_dist, method = 'complete')

plot(hc_complete)
```

#### Silhouette

```{r}
res_test <- careerBatting_num1 %>% kmeans(7)
  str(res_test)
```


```{r}
distance <- get_dist(careerBatting_num1, method = "euclidean")
sil <- silhouette(x = res_test$cluster, dist = distance)
summary(sil)
sil %>% head()
```

```{r}
fviz_silhouette(sil)
```

```{r}
fviz_nbclust(careerBatting_num1, hcut, hc_method = "complete", hc_metric = "euclidean", method = "wss")
```

```{r}
##This is to test other values of K for the silhouette method.
res_test1 <- careerBatting_num1 %>% kmeans(10 )
  str(res_test1)
```


```{r}
distance <- get_dist(careerBatting_num1, method="euclidean")
sil <- silhouette(x = res_test1$cluster, dist = distance)
summary(sil)
sil %>% head()
```

```{r}
fviz_silhouette(sil)
```


#### Diana

## Linear Regression (Lesson 6)

Linear Regression comparing team payroll and win rate.
```{r}
teams = as.data.table(Teams)
teams = teams[, .(yearID,
                  lgID = as.character(lgID),
                  teamID = as.character(teamID),
                  franchID = as.character(franchID),
                  Rank, G, W, L, R, ERA, SO,
                  WinPercent = W/(W+L))]

salaries = as.data.table(Salaries)
salaries = salaries[, c("lgID", "teamID", "salary1M") :=
                      list(as.character(lgID), as.character(teamID), salary / 1e6L)]
payroll = salaries[, .(payroll = sum(salary1M)), by=.(teamID, yearID)]
teamPayroll = merge(teams, payroll, by = c("teamID", "yearID"))
```

```{r}
ggplot(data = teamPayroll, aes(x = payroll, y = WinPercent)) + geom_point()  + labs(x = "Payroll (in millions)", y = "Win Percentage") +
  geom_smooth(method = lm, se = FALSE)

```
```{r}
mod_lm <- lm(data = teamPayroll, WinPercent~payroll)
mod_lm
```

```{r}
summary(mod_lm)
```
```{r}
payroll_pred <- teamPayroll %>%
  add_predictions(mod_lm)

payroll_pred %>%
  filter(yearID >= 2010) %>%
  arrange(desc(pred)) %>%
  head(25)
```
```{r}
payroll_pred %>%
  filter(yearID >= 2010) %>%
  arrange(desc(WinPercent)) %>%
  head(25)
```
Only five teams are in the top 25 of both payroll and win percentage in the 2010s. These teams are the 2011 Phillies, 2011 Yankees, 2010 Yankees, 2012 Yankees, and 2016 Rangers. This shows that spending the most money doesn't automatically mean you are getting the best product on the field.
## Simple Linear Regression

## Multiple Linear Regression
```{r}
bstats_salary <- bstats_salary %>%
  filter(PA >= 100) %>%
  filter(salary > 500000)
```


```{r}
lm_mod <- lm(salary ~ H, HR, data = bstats_salary_21century)
summary(lm_mod)
```

```{r}
lm_mod_prd <- bstats_salary_21century %>% add_predictions(lm_mod)
lm_mod_prd
```

```{r}
full_model <- lm(salary ~., data = bstats_salary_21century)
summary(full_model)
```

```{r}
full_model_pred <- bstats_salary_21century %>% add_predictions(full_model)
full_model_pred
```

```{r}
adv_stat_mod <- lm(salary ~ OPS, data = bstats_salary_21century)
summary(adv_stat_mod)
```


## Resampling Methods

```{r}
#including 2002 and up because salary becomes higher
bstats_salary_21century <- bstats_salary %>%
  filter(yearID >= 2002)
```


```{r}
bstats_salary_21century %>% head(10)
```



```{r}
# setting seed to generate a reproducible random sampling
set.seed(123)
 
# defining training control as cross-validation and value of K equal to 10
train_control <- trainControl(method = "cv",
                              number = 10)

# training the model
model <- train(salary ~ OBP, data = bstats_salary_21century,
               method = "lm",
               trControl = train_control)

print(model)
```


## Feature Selection
```{r}
bstats_salary_numvars <- bstats_salary_21century %>% 
  select(c(6:32))
```

```{r}
regfit.full = regsubsets(salary ~., data = bstats_salary_numvars,  nvmax = 13, method="exhaustive")
summary(regfit.full)
```

```{r}
summary(regfit.full)$rsq
```



```{r}
plot(summary(regfit.full)$rsq)
```

```{r}
reg.summary <- summary(regfit.full) #get the summary

par(mfrow=c(2,2))
#rss plot -  NOT USEFUL
plot(reg.summary$rss ,xlab="Number of Variables ",ylab="RSS",type="l")

#adjr2 plot
plot(reg.summary$adjr2 ,xlab="Number of Variables ", ylab="Adjusted RSq",type="l")

max_adjr2 <- which.max(reg.summary$adjr2)
points(max_adjr2,reg.summary$adjr2[max_adjr2], col="red",cex=2,pch=20)

# AIC criterion (Cp) to minimize
plot(reg.summary$cp ,xlab="Number of Variables ",ylab="Cp", type='l')

min_cp <- which.min(reg.summary$cp )
points(min_cp, reg.summary$cp[min_cp],col="red",cex=2,pch=20)

# BIC criterion to minimize
plot(reg.summary$bic ,xlab="Number of Variables ",ylab="BIC",type='l')

min_bic <- which.min(reg.summary$bic)
points(min_bic,reg.summary$bic[min_bic],col="red",cex=2,pch=20)
```

```{r}
#Forward stepwise selection
regfit.fwd = regsubsets(salary ~. , data=bstats_salary_numvars, nvmax=13, method ="forward")
summary(regfit.fwd)
```

```{r}
reg.summary <- summary(regfit.fwd) #get the summary

par(mfrow=c(2,2))
#rss plot -  NOT USEFUL
plot(reg.summary$rss ,xlab="Number of Variables ",ylab="RSS",type="l")

#adjr2 plot
plot(reg.summary$adjr2 ,xlab="Number of Variables ", ylab="Adjusted RSq",type="l")

max_adjr2 <- which.max(reg.summary$adjr2)
points(max_adjr2,reg.summary$adjr2[max_adjr2], col="red",cex=2,pch=20)

# AIC criterion (Cp) to minimize
plot(reg.summary$cp ,xlab="Number of Variables ",ylab="Cp", type='l')

min_cp <- which.min(reg.summary$cp )
points(min_cp, reg.summary$cp[min_cp],col="red",cex=2,pch=20)

# BIC criterion to minimize
plot(reg.summary$bic ,xlab="Number of Variables ",ylab="BIC",type='l')

min_bic <- which.min(reg.summary$bic)
points(min_bic,reg.summary$bic[min_bic],col="red",cex=2,pch=20)
```

```{r}
#Backwards stepwise selection
regfit.bwd = regsubsets(salary ~. , data=bstats_salary_numvars,nvmax=13, method ="backward")
summary(regfit.bwd)
```

```{r}
reg.summary <- summary(regfit.bwd) #get the summary

par(mfrow=c(2,2))
#rss plot -  NOT USEFUL
plot(reg.summary$rss ,xlab="Number of Variables ",ylab="RSS",type="l")

#adjr2 plot
plot(reg.summary$adjr2 ,xlab="Number of Variables ", ylab="Adjusted RSq",type="l")

max_adjr2 <- which.max(reg.summary$adjr2)
points(max_adjr2, reg.summary$adjr2[max_adjr2], col="red", cex=2, pch=20)

# AIC criterion (Cp) to minimize
plot(reg.summary$cp ,xlab="Number of Variables ",ylab="Cp", type='l')

min_cp <- which.min(reg.summary$cp )
points(min_cp, reg.summary$cp[min_cp], col="red", cex=2, pch=20)

# BIC criterion to minimize
plot(reg.summary$bic, xlab="Number of Variables ", ylab="BIC", type='l')

min_bic <- which.min(reg.summary$bic)
points(min_bic, reg.summary$bic[min_bic], col="red", cex=2, pch=20)
```

```{r}
#ridge regression 

# getting the predictors
x_var <- bstats_salary_numvars %>% select(-salary) %>% as.matrix()
# getting the independent variable
y_var <- bstats_salary_numvars[,"salary"]
```

```{r}
ridge <- glmnet(x_var, y_var, alpha=0)
summary(ridge)
```

```{r}
cv_ridge <- cv.glmnet(x_var, y_var, alpha = 0)
cv_ridge
```

```{r}
plot(cv_ridge)
```

```{r}
cv_ridge$lambda.min
```

```{r}
cv_ridge$lambda.1se
```

```{r}
lbs_fun <- function(fit, offset_x=1, ...) {
  L <- length(fit$lambda)
  x <- log(fit$lambda[L]) + offset_x
  y <- fit$beta[ ,L]
  labs <- names(y)
  text(x, y, labels=labs, ...)
}

plot(ridge, xvar = "lambda", label=T)
lbs_fun(ridge) # add namnes

abline(v = log(cv_ridge$lambda.min), col = "red", lty=2) #lambda.min
abline(v = log(cv_ridge$lambda.1se), col="blue", lty=2)  #lambda.1se
```

```{r}
min_ridge <- glmnet(x_var, y_var, alpha=0, lambda = cv_ridge$lambda.min)
coef(min_ridge)
```

```{r}
# Make predictions on the test data
predictions <- min_ridge %>% predict(x_var) %>% as.vector()

# Model performance metrics
data.frame(
  RMSE = RMSE(predictions, y_var),
  Rsquare = R2(predictions, y_var)
)
```

```{r}
# Lasso 

# getting the predictors
x_var <- bstats_salary_numvars %>% select(-salary) %>% as.matrix()
# getting the independent variable
y_var <- bstats_salary_numvars[,"salary"]
```


```{r}
lasso <- glmnet(x_var, y_var, alpha=1)
summary(lasso)
```

```{r}
cv_lasso <- cv.glmnet(x_var, y_var, alpha = 1)
cv_lasso
```

```{r}
plot(cv_lasso)
```


```{r}
lbs_fun <- function(fit, offset_x=1, ...) {
  L <- length(fit$lambda)
  x <- log(fit$lambda[L])+ offset_x
  y <- fit$beta[, L]
  labs <- names(y)
  text(x, y, labels=labs, ...)
}
plot(lasso, xvar = "lambda", label=T)
lbs_fun(lasso)

abline(v=log(cv_lasso$lambda.min), col = "red", lty=2)
abline(v=log(cv_lasso$lambda.1se), col="blue", lty=2)
```

```{r}
min_lasso <- glmnet(x_var, y_var, alpha=1, lambda = cv_lasso$lambda.min)
coef(min_lasso)
```

```{r}
se_lasso <- glmnet(x_var, y_var, alpha=1, lambda = cv_lasso$lambda.1se)
coef(se_lasso)
```

```{r}
# Make predictions on the test data
predictions <- min_lasso %>% predict(x_var) %>% as.vector()
# Model performance metrics
data.frame(
  RMSE = RMSE(predictions, y_var),
  Rsquare = R2(predictions, y_var)
)
```



## Salary Data
```{r}
franchise <- c(`ANA` = "LAA", `ARI` = "ARI", `ATL` = "ATL", 
               `BAL` = "BAL", `BOS` = "BOS", `CAL` = "LAA",
               `CHA` = "CHA", `CHN` = "CHN", `CIN` = "CIN", 
               `CLE` = "CLE", `COL` = "COL", `DET` = "DET", 
               `FLO` = "MIA", `HOU` = "HOU", `KCA` = "KCA", 
               `LAA` = "LAA", `LAN` = "LAN", `MIA` = "MIA", 
               `MIL` = "MIL", `MIN` = "MIN", `ML4` = "MIL", 
               `MON` = "WAS", `NYA` = "NYA", `NYM` = "NYN", 
               `NYN` = "NYN", `OAK` = "OAK", `PHI` = "PHI", 
               `PIT` = "PIT", `SDN` = "SDN", `SEA` = "SEA",
               `SFG` = "SFN", `SFN` = "SFN", `SLN` = "SLN", 
               `TBA` = "TBA", `TEX` = "TEX", `TOR` = "TOR",
               `WAS` = "WAS")
```

```{r}
Salaries$franchise <- unname(franchise[Salaries$teamID])
```


```{r}
avg_team_salaries <- Salaries %>%
    group_by(yearID, franchise, lgID) %>%
    summarise(salary = mean(salary)/1e6) %>%
    filter(!(franchise == "CLE" & lgID == "NL"))
```

```{r}
ggplot(avg_team_salaries, 
       aes(x = yearID, y = salary, group = factor(franchise))) +
       geom_path() +
       labs(x = "Year", y = "Average team salary (millions USD)")
```

```{r}
ggplot(Salaries, aes(x = factor(yearID), y = salary/1e5)) +
   geom_boxplot(fill = "lightblue", outlier.size = 1) +
   labs(x = "Year", y = "Salary (per $1,000,000)") +
   coord_flip()
```
```{r}
avg_team_salaries1 <- Salaries %>%
    group_by(yearID, franchise, lgID) %>%
    summarise(salary= mean(salary)/1e6) %>%
    filter(!(franchise == "CLE" & lgID == "NL")) %>%
    filter(yearID >= 2002)

avg_team_salaries1 %>%
  arrange(desc(salary))
```
```{r}
ggplot(avg_team_salaries1, aes(x = franchise, y = salary)) +
  geom_bar(stat = "identity") +
  labs(x = "Team", y = "Salary (per $100,000)")
```

```{r}
ggplot(avg_team_salaries1, aes(x = franchise, y = salary, fill = franchise)) +
   geom_boxplot(outlier.size = 1) +
   labs(x = "Year", y = "Average Team Salary Since 2002 (per $10,000,000)") +
   coord_flip()
```


=======
---
title: "R Notebook"
output: html_notebook
editor_options: 
  chunk_output_type: inline
---

```{r}
rm(list = ls())

library(Lahman)
library(mosaic)
library(tidyr)
library(tidyverse)
library(dplyr)
library(mplot)
library(ggplot2)
library(cluster)
library(factoextra)
library(corrplot)
library(data.table)
library(mod)
library(modelr)
library(leaps)
library(caret)
library(ISLR2)
library(ggcorrplot)
library(glmnet)
```

```{r}
#Load in People, Batting, and Pitching Dataframes
data("People") 
data("Batting")
data("Pitching")
```

```{r}
#Merges player name to Batting data. 
bstats <- battingStats()
	str(bstats)
	

People$name <- paste(People$nameFirst, People$nameLast, sep = " ")

batting_name <- merge(Batting,
                 People[,c("playerID", "name")],
                 by = "playerID", all.x = TRUE)

#Merges player name to Pitching data.

People$name <- paste(People$nameFirst, People$nameLast, sep = " ")

pitching_name <- merge(Pitching,
                 People[,c("playerID", "name")],
                 by = "playerID", all.x = TRUE)
```

```{r}
#Creating additional stats for bstats
bstats[is.na(bstats)] = 0
#is.nan(bstats)

bstats <- bstats %>%
  mutate(K_Percent = SO / PA) %>%
  mutate(BB_Percent = (BB + IBB) / PA) %>%
  mutate_all(~replace(., is.nan(.), 0))

```

```{r}
bstats <- bstats %>%
  mutate_at(vars(K_Percent, BB_Percent), funs(round(., 3)))
```

```{r}
bstats_salary <- bstats %>%
              filter(yearID >= 1985) %>%
              left_join(select(Salaries, playerID, yearID, teamID, salary), 
                         by=c("playerID", "yearID", "teamID"))

bstats_salary[is.na(bstats_salary)] = 0
str(bstats_salary)

```

```{r}
bstats_sure <- bstats_salary %>%
  filter(PA > 150) %>%
  select(OPS, BABIP, K_Percent, BB_Percent, salary)
```

## Data Preparation (Lesson 1 & 2)

```{r}
#Keep players with over 150 at bats. (We can change this value if necessary).
#Creating batting average variable.

batting1 <- bstats %>%
  filter(AB >= 150)
  
```

```{r}
bstats %>%
  filter(playerID == "bogaexa01")
```

## Exploratory Analysis (Lesson 1 & 2)
Lessons 1 and 2 will just be parts of the overall project. Simple things like data manipulation, apply functions, boxplots, etc. This will be data preparation items and exploratory analysis.

```{r}
b <- ggplot(batting1, aes(x = teamID, y = HR)) +
  geom_boxplot(col = "black", aes(fill = teamID))
b

```

```{r}
hitters1 <- batting1 %>%
  filter(yearID < 1895) %>%
  select(SlugPct)

hitters2 <- batting1 %>%
  filter(yearID > 1894, yearID < 1921) %>%
  select(SlugPct)

hitters3 <- batting1 %>%
  filter(yearID > 1920, yearID < 1969) %>%
  select(SlugPct)

hitters4 <- batting1 %>%
  filter(yearID > 1969) %>%
  select(SlugPct)
#Organizing 4 different datasets looking at slugging percentage for the following boxplots. All of these are somewhat different eras, with the most dramatic split being from before 1920 (pre-Babe Ruth) and after 1920 (during and post-Babe Ruth)
```

```{r}
boxplot(hitters1,
        main = "Slugging percentage from late 1871 - 1894",
        ylab = "Slugging percentage",
        col = "blue",
        horizontal = TRUE)
```

```{r}
boxplot(hitters2, 
        main = "Slugging percentage from 1895-1920",
        ylab = "Slugging percentage",
        col = "yellow",
        horizontal = TRUE)
```

```{r}
boxplot(hitters3, 
        main = "Slugging percentage from 1921-1968",
        ylab = "Slugging percentage",
        col = "red",
        horizontal = TRUE)
```

```{r}
boxplot(hitters4, 
        main = "Slugging percentage from 1969 - present",
        ylab = "Slugging percentage",
        col = "red",
        horizontal = TRUE)
```


```{r}
sapply(hitters1, mean, na.rm = T)
sapply(hitters2, mean, na.rm = T)
sapply(hitters3, mean, na.rm = T)
sapply(hitters4, mean, na.rm = T)
#Notice that gigantic increase between hitters2 and hitters3
```

```{r}
summary(hitters1)
```

```{r}
summary(hitters2)
```

```{r}
summary(hitters3)
```

```{r}
summary(hitters4)
```

```{r}
#Keep batting stats that we want for pairs.
batting_num <- bstats %>%
  filter(PA >= 150) %>%
  select("BA", 'OBP', 'SlugPct', "SO", "BB", "HR")
  
```

```{r}
pairs(batting_num)
```
#### Career Batting Stats
```{r}
careerBatting <- na.omit(bstats)
```

```{r}
careerBatting <- careerBatting %>%
  select(playerID, BA, PA, SlugPct, OBP, SO, HR) %>%
  group_by(playerID) %>%
  summarise_all('mean')
```

```{r}
careerBatting_num <- careerBatting %>%
  filter(PA >= 150) %>%
  select(BA, PA, SlugPct, OBP, SO, HR)

pairs(careerBatting_num)
```
```{r}
corrmatrix <- cor(batting_num)
corrplot(corrmatrix, method = 'number') #Gives us correlation from pairs graph.
```

```{r}
careerBatting_num1 <- careerBatting_num %>%
  filter(PA > 500)
```


## 0-dimensional Reduction (Lesson 4)


#### Bootstrapping

## PCA (Lesson 4)
```{r}
res <- batting_num %>% prcomp(scale = TRUE)
res
```

```{r}
loadings <- res$rotation
loadings
```

```{r}
score_mat <- res$x
score_mat
```


```{r}
get_eig(res)
```

#### Screeplot
```{r}
get_eig(res) %>%
  ggplot(aes(x = 1:6, y = cumulative.variance.percent)) +
  geom_line() +
  geom_point() +
  geom_hline(yintercept = 80) +
  xlab("Principal Component") +
  ylab("Proportion of Variance Explained") +
  ggtitle("Scree Plot of Principal Component for Batting Statistics")
```

2 Principal Components: PC1 and PC2

```{r}
fviz_screeplot(res, main = "Scree Plot")
```

Can Identify an elbow in 3.

#### Biplot
```{r}
res %>%
  fviz_pca_var(axes = c(1,2),
               col.var = "contrib",
               gradient.cols = c("#00AFBB", "#E7B800", "#FC4E07"),
               repel = TRUE
               )
```


## Cluster Analysis (Lesson 5)
```{r}
#NOT COMPLETE!!!!! This was just a test, bstats is way too big.
bstats_best <- bstats %>%
  filter(PA >= 600)

eu_dist <- get_dist(careerBatting_num1, method = 'euclidean')
```

```{r}
hc_complete <- hclust(eu_dist, method = 'complete')

plot(hc_complete)
```

#### Silhouette

```{r}
res_test <- careerBatting_num1 %>% kmeans(7)
  str(res_test)
```


```{r}
distance <- get_dist(careerBatting_num1, method = "euclidean")
sil <- silhouette(x = res_test$cluster, dist = distance)
summary(sil)
sil %>% head()
```

```{r}
fviz_silhouette(sil)
```

```{r}
fviz_nbclust(careerBatting_num1, hcut, hc_method = "complete", hc_metric = "euclidean", method = "wss")
```

```{r}
##This is to test other values of K for the silhouette method.
res_test1 <- careerBatting_num1 %>% kmeans(10 )
  str(res_test1)
```


```{r}
distance <- get_dist(careerBatting_num1, method="euclidean")
sil <- silhouette(x = res_test1$cluster, dist = distance)
summary(sil)
sil %>% head()
```

```{r}
fviz_silhouette(sil)
```


#### Diana

## Linear Regression (Lesson 6)

Linear Regression comparing team payroll and win rate.
```{r}
teams = as.data.table(Teams)
teams = teams[, .(yearID,
                  lgID = as.character(lgID),
                  teamID = as.character(teamID),
                  franchID = as.character(franchID),
                  Rank, G, W, L, R, ERA, SO,
                  WinPercent = W/(W+L))]

salaries = as.data.table(Salaries)
salaries = salaries[, c("lgID", "teamID", "salary1M") :=
                      list(as.character(lgID), as.character(teamID), salary / 1e6L)]
payroll = salaries[, .(payroll = sum(salary1M)), by=.(teamID, yearID)]
teamPayroll = merge(teams, payroll, by = c("teamID", "yearID"))
```

```{r}
ggplot(data = teamPayroll, aes(x = payroll, y = WinPercent)) + geom_point()  + labs(x = "Payroll (in millions)", y = "Win Percentage") +
  geom_smooth(method = lm, se = FALSE)

```
```{r}
mod_lm <- lm(data = teamPayroll, WinPercent~payroll)
mod_lm
```

```{r}
summary(mod_lm)
```
```{r}
payroll_pred <- teamPayroll %>%
  add_predictions(mod_lm)

payroll_pred %>%
  filter(yearID >= 2010) %>%
  arrange(desc(pred)) %>%
  head(25)
```
```{r}
payroll_pred %>%
  filter(yearID >= 2010) %>%
  arrange(desc(WinPercent)) %>%
  head(25)
```
Only five teams are in the top 25 of both payroll and win percentage in the 2010s. These teams are the 2011 Phillies, 2011 Yankees, 2010 Yankees, 2012 Yankees, and 2016 Rangers. This shows that spending the most money doesn't automatically mean you are getting the best product on the field.
## Simple Linear Regression

## Multiple Linear Regression
```{r}
bstats_salary <- bstats_salary %>%
  filter(PA >= 100) %>%
  filter(salary > 500000)
```


```{r}
lm_mod <- lm(salary ~ H, HR, data = bstats_salary)
summary(lm_mod)
```

```{r}
lm_mod_prd <- bstats_salary %>% add_predictions(lm_mod)
lm_mod_prd
```

```{r}
full_model <- lm(salary ~., data = bstats_sure)
summary(full_model)
```

```{r}
full_model_pred <- bstats_sure %>% add_predictions(full_model)
full_model_pred
```

```{r}
adv_stat_mod <- lm(salary ~ OPS, data = bstats_salary)
summary(adv_stat_mod)
```


## Resampling Methods

```{r}
#including 2002 and up because salary becomes higher
bstats_salary_21century <- bstats_salary %>%
  filter(yearID >= 2002)
```


```{r}
bstats_salary_21century %>% head(10)
```



```{r}
# setting seed to generate a reproducible random sampling
set.seed(123)
 
# defining training control as cross-validation and value of K equal to 10
train_control <- trainControl(method = "cv",
                              number = 10)

# training the model
model <- train(salary ~ OBP, data = bstats_salary_21century,
               method = "lm",
               trControl = train_control)

print(model)
```


## Feature Selection
```{r}
bstats_salary_numvars <- bstats_salary_21century %>% 
  select(c(6:32))
```

```{r}
#Correlation mapping 

#making correlation heat map 
corr_numeric <- round(cor(bstats_salary_numvars), 1)

#plot to visualize the correlations 
ggcorrplot(corr_numeric,
           type = "lower",
           lab = TRUE, 
           lab_size = 2,  
           colors = c("tomato2", "white", "springgreen3"),
           title="Correlogram of batting Data", 
           ggtheme=theme_bw)
```

```{r}
regfit.full = regsubsets(salary ~., data = bstats_salary_numvars,  nvmax = 13, method="exhaustive")
summary(regfit.full)
```

```{r}
summary(regfit.full)$rsq
```



```{r}
plot(summary(regfit.full)$rsq)
```

```{r}
reg.summary <- summary(regfit.full) #get the summary

par(mfrow=c(2,2))
#rss plot -  NOT USEFUL
plot(reg.summary$rss ,xlab="Number of Variables ",ylab="RSS",type="l")

#adjr2 plot
plot(reg.summary$adjr2 ,xlab="Number of Variables ", ylab="Adjusted RSq",type="l")

max_adjr2 <- which.max(reg.summary$adjr2)
points(max_adjr2,reg.summary$adjr2[max_adjr2], col="red",cex=2,pch=20)

# AIC criterion (Cp) to minimize
plot(reg.summary$cp ,xlab="Number of Variables ",ylab="Cp", type='l')

min_cp <- which.min(reg.summary$cp )
points(min_cp, reg.summary$cp[min_cp],col="red",cex=2,pch=20)

# BIC criterion to minimize
plot(reg.summary$bic ,xlab="Number of Variables ",ylab="BIC",type='l')

min_bic <- which.min(reg.summary$bic)
points(min_bic,reg.summary$bic[min_bic],col="red",cex=2,pch=20)
```

```{r}
#Forward stepwise selection
regfit.fwd = regsubsets(salary ~. , data=bstats_salary_numvars, nvmax=13, method ="forward")
summary(regfit.fwd)
```

```{r}
reg.summary <- summary(regfit.fwd) #get the summary

par(mfrow=c(2,2))
#rss plot -  NOT USEFUL
plot(reg.summary$rss ,xlab="Number of Variables ",ylab="RSS",type="l")

#adjr2 plot
plot(reg.summary$adjr2 ,xlab="Number of Variables ", ylab="Adjusted RSq",type="l")

max_adjr2 <- which.max(reg.summary$adjr2)
points(max_adjr2,reg.summary$adjr2[max_adjr2], col="red",cex=2,pch=20)

# AIC criterion (Cp) to minimize
plot(reg.summary$cp ,xlab="Number of Variables ",ylab="Cp", type='l')

min_cp <- which.min(reg.summary$cp )
points(min_cp, reg.summary$cp[min_cp],col="red",cex=2,pch=20)

# BIC criterion to minimize
plot(reg.summary$bic ,xlab="Number of Variables ",ylab="BIC",type='l')

min_bic <- which.min(reg.summary$bic)
points(min_bic,reg.summary$bic[min_bic],col="red",cex=2,pch=20)
```

```{r}
#Backwards stepwise selection
regfit.bwd = regsubsets(salary ~. , data=bstats_salary_numvars,nvmax=13, method ="backward")
summary(regfit.bwd)
```

```{r}
reg.summary <- summary(regfit.bwd) #get the summary

par(mfrow=c(2,2))
#rss plot -  NOT USEFUL
plot(reg.summary$rss ,xlab="Number of Variables ",ylab="RSS",type="l")

#adjr2 plot
plot(reg.summary$adjr2 ,xlab="Number of Variables ", ylab="Adjusted RSq",type="l")

max_adjr2 <- which.max(reg.summary$adjr2)
points(max_adjr2, reg.summary$adjr2[max_adjr2], col="red", cex=2, pch=20)

# AIC criterion (Cp) to minimize
plot(reg.summary$cp ,xlab="Number of Variables ",ylab="Cp", type='l')

min_cp <- which.min(reg.summary$cp )
points(min_cp, reg.summary$cp[min_cp], col="red", cex=2, pch=20)

# BIC criterion to minimize
plot(reg.summary$bic, xlab="Number of Variables ", ylab="BIC", type='l')

min_bic <- which.min(reg.summary$bic)
points(min_bic, reg.summary$bic[min_bic], col="red", cex=2, pch=20)
```

```{r}
#ridge regression 

# getting the predictors
x_var <- bstats_salary_numvars %>% select(-salary) %>% as.matrix()
# getting the independent variable
y_var <- bstats_salary_numvars[,"salary"]
```

```{r}
ridge <- glmnet(x_var, y_var, alpha=0)
summary(ridge)
```

```{r}
cv_ridge <- cv.glmnet(x_var, y_var, alpha = 0)
cv_ridge
```

```{r}
plot(cv_ridge)
```

```{r}
cv_ridge$lambda.min
```

```{r}
cv_ridge$lambda.1se
```

```{r}
lbs_fun <- function(fit, offset_x=1, ...) {
  L <- length(fit$lambda)
  x <- log(fit$lambda[L]) + offset_x
  y <- fit$beta[ ,L]
  labs <- names(y)
  text(x, y, labels=labs, ...)
}

plot(ridge, xvar = "lambda", label=T)
lbs_fun(ridge) # add namnes

abline(v = log(cv_ridge$lambda.min), col = "red", lty=2) #lambda.min
abline(v = log(cv_ridge$lambda.1se), col="blue", lty=2)  #lambda.1se
```

```{r}
min_ridge <- glmnet(x_var, y_var, alpha=0, lambda = cv_ridge$lambda.min)
coef(min_ridge)
```

```{r}
# Make predictions on the test data
predictions <- min_ridge %>% predict(x_var) %>% as.vector()

# Model performance metrics
data.frame(
  RMSE = RMSE(predictions, y_var),
  Rsquare = R2(predictions, y_var)
)
```

```{r}
# Lasso 

# getting the predictors
x_var <- bstats_salary_numvars %>% select(-salary) %>% as.matrix()
# getting the independent variable
y_var <- bstats_salary_numvars[,"salary"]
```


```{r}
lasso <- glmnet(x_var, y_var, alpha=1)
summary(lasso)
```

```{r}
cv_lasso <- cv.glmnet(x_var, y_var, alpha = 1)
cv_lasso
```

```{r}
plot(cv_lasso)
```


```{r}
lbs_fun <- function(fit, offset_x=1, ...) {
  L <- length(fit$lambda)
  x <- log(fit$lambda[L])+ offset_x
  y <- fit$beta[, L]
  labs <- names(y)
  text(x, y, labels=labs, ...)
}
plot(lasso, xvar = "lambda", label=T)
lbs_fun(lasso)

abline(v=log(cv_lasso$lambda.min), col = "red", lty=2)
abline(v=log(cv_lasso$lambda.1se), col="blue", lty=2)
```

```{r}
min_lasso <- glmnet(x_var, y_var, alpha=1, lambda = cv_lasso$lambda.min)
coef(min_lasso)
```

```{r}
se_lasso <- glmnet(x_var, y_var, alpha=1, lambda = cv_lasso$lambda.1se)
coef(se_lasso)
```

```{r}
# Make predictions on the test data
predictions <- min_lasso %>% predict(x_var) %>% as.vector()
# Model performance metrics
data.frame(
  RMSE = RMSE(predictions, y_var),
  Rsquare = R2(predictions, y_var)
)
```



## Salary Data
```{r}
franchise <- c(`ANA` = "LAA", `ARI` = "ARI", `ATL` = "ATL", 
               `BAL` = "BAL", `BOS` = "BOS", `CAL` = "LAA",
               `CHA` = "CHA", `CHN` = "CHN", `CIN` = "CIN", 
               `CLE` = "CLE", `COL` = "COL", `DET` = "DET", 
               `FLO` = "MIA", `HOU` = "HOU", `KCA` = "KCA", 
               `LAA` = "LAA", `LAN` = "LAN", `MIA` = "MIA", 
               `MIL` = "MIL", `MIN` = "MIN", `ML4` = "MIL", 
               `MON` = "WAS", `NYA` = "NYA", `NYM` = "NYN", 
               `NYN` = "NYN", `OAK` = "OAK", `PHI` = "PHI", 
               `PIT` = "PIT", `SDN` = "SDN", `SEA` = "SEA",
               `SFG` = "SFN", `SFN` = "SFN", `SLN` = "SLN", 
               `TBA` = "TBA", `TEX` = "TEX", `TOR` = "TOR",
               `WAS` = "WAS")
```

```{r}
Salaries$franchise <- unname(franchise[Salaries$teamID])
```


```{r}
avg_team_salaries <- Salaries %>%
    group_by(yearID, franchise, lgID) %>%
    summarise(salary = mean(salary)/1e6) %>%
    filter(!(franchise == "CLE" & lgID == "NL"))
```

```{r}
ggplot(avg_team_salaries, 
       aes(x = yearID, y = salary, group = factor(franchise))) +
       geom_path() +
       labs(x = "Year", y = "Average team salary (millions USD)")
```

```{r}
ggplot(Salaries, aes(x = factor(yearID), y = salary/1e5)) +
   geom_boxplot(fill = "lightblue", outlier.size = 1) +
   labs(x = "Year", y = "Salary (per $1,000,000)") +
   coord_flip()
```
```{r}
avg_team_salaries1 <- Salaries %>%
    group_by(yearID, franchise, lgID) %>%
    summarise(salary= mean(salary)/1e6) %>%
    filter(!(franchise == "CLE" & lgID == "NL")) %>%
    filter(yearID >= 2002)

avg_team_salaries1 %>%
  arrange(desc(salary))
```
```{r}
ggplot(avg_team_salaries1, aes(x = franchise, y = salary)) +
  geom_bar(stat = "identity") +
  labs(x = "Team", y = "Salary (per $100,000)")
```

```{r}
ggplot(avg_team_salaries1, aes(x = franchise, y = salary, fill = franchise)) +
   geom_boxplot(outlier.size = 1) +
   labs(x = "Year", y = "Average Team Salary Since 2002 (per $10,000,000)") +
   coord_flip()
```


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